Vulnerability-Lookup

CVE-2026-82731 (GCVE-0-2026-82731)

Vulnerability from cvelistv5 – Published: 2026-09-01 02:09 – Updated: 2026-09-01 15:13

Title

Unescaped path parameters in AshTypescript generated TypeScript client allow request redirection

Summary

URL Redirection to Untrusted Site ('Open Redirect') vulnerability in ash-project ash_typescript allows an attacker who controls a path-parameter value to redirect a generated client's request, and the credentials attached to it, to an unintended route or an external origin. The URL builders in lib/ash_typescript/typed_controller/codegen/route_renderer.ex replace each :param placeholder with a bare template interpolation and never call encodeURIComponent, so the value reaches executeTypedControllerRequest raw. A value containing ../ is normalised away by the fetch URL resolver and reaches a different route, while ? or # truncates the path and can smuggle or override query parameters. For a route whose path begins with a parameter, a value such as /evil.example.com/x yields the protocol-relative URL //evil.example.com/x, sending the request and the credentials from TypedControllerConfig to an attacker-controlled host. Nothing constrains the value at runtime: get_path_param_type/2 emits only a TypeScript type, which is erased. The query-string path is unaffected, since URLSearchParams.set encodes its own values. This issue affects ash_typescript: from 0.15.0 before 0.18.0.

Severity

2.3 (Low)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 15:13 UTC

CWE

CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Assigner

EEF mitre root

References

4 references

URL	Tags
https://github.com/ash-project/ash_typescript/sec…	relatedvendor-advisory
https://cna.erlef.org/cves/CVE-2026-82731.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-82731	related
https://github.com/ash-project/ash_typescript/com…	patch

Impacted products

2 products

Vendor	Product	Version	CPE status
ash-project	ash_typescript	Affected: 0.15.0 , < 0.18.0 (semver) cpe:2.3:a:ash-project:ash_typescript::::::::
ash-project	ash_typescript	Affected: 6669e22ece34b4534e706a46d1842f01b68ee23a , < 5165f752f5f92b755d946f2d1ce750ff69083ffc (git) cpe:2.3:a:ash-project:ash_typescript::::::::

Credits

Peter Ullrich Peter Ullrich Torkild Gundersen Kjevik / Ash Project Jonatan Männchen / EEF

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-82731",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-01T15:13:34.848553Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-01T15:13:54.605Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027"
          ],
          "packageName": "ash_typescript",
          "packageURL": "pkg:hex/ash_typescript",
          "product": "ash_typescript",
          "programFiles": [
            "lib/ash_typescript/typed_controller/codegen/route_renderer.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027:build_url_template_to_variable/4"
            }
          ],
          "repo": "https://github.com/ash-project/ash_typescript",
          "vendor": "ash-project",
          "versions": [
            {
              "lessThan": "0.18.0",
              "status": "affected",
              "version": "0.15.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027"
          ],
          "packageName": "ash-project/ash_typescript",
          "packageURL": "pkg:github/ash-project/ash_typescript",
          "product": "ash_typescript",
          "programFiles": [
            "lib/ash_typescript/typed_controller/codegen/route_renderer.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027:build_url_template_to_variable/4"
            }
          ],
          "repo": "https://github.com/ash-project/ash_typescript",
          "vendor": "ash-project",
          "versions": [
            {
              "lessThan": "5165f752f5f92b755d946f2d1ce750ff69083ffc",
              "status": "affected",
              "version": "6669e22ece34b4534e706a46d1842f01b68ee23a",
              "versionType": "git"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eThe application ships a TypeScript client generated by AshTypescript for a typed-controller route taking a path parameter, and passes untrusted input as that parameter.\u003c/p\u003e"
            },
            {
              "base64": false,
              "type": "text/markdown",
              "value": "The application ships a TypeScript client generated by AshTypescript for a typed-controller route taking a path parameter, and passes untrusted input as that parameter."
            }
          ],
          "value": "The application ships a TypeScript client generated by AshTypescript for a typed-controller route taking a path parameter, and passes untrusted input as that parameter."
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "0.18.0",
                  "versionStartIncluding": "0.15.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ],
          "operator": "AND"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Peter Ullrich"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Peter Ullrich"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Torkild Gundersen Kjevik / Ash Project"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Jonatan M\u00e4nnchen / EEF"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eURL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in ash-project ash_typescript allows an attacker who controls a path-parameter value to redirect a generated client\u0027s request, and the credentials attached to it, to an unintended route or an external origin.\u003c/p\u003e\n\u003cp\u003eThe URL builders in \u003ccode\u003elib/ash_typescript/typed_controller/codegen/route_renderer.ex\u003c/code\u003e replace each \u003ccode\u003e:param\u003c/code\u003e placeholder with a bare template interpolation and never call \u003ccode\u003eencodeURIComponent\u003c/code\u003e, so the value reaches \u003ccode\u003eexecuteTypedControllerRequest\u003c/code\u003e raw. A value containing \u003ccode\u003e../\u003c/code\u003e is normalised away by the fetch URL resolver and reaches a different route, while \u003ccode\u003e?\u003c/code\u003e or \u003ccode\u003e#\u003c/code\u003e truncates the path and can smuggle or override query parameters. For a route whose path begins with a parameter, a value such as \u003ccode\u003e/evil.example.com/x\u003c/code\u003e yields the protocol-relative URL \u003ccode\u003e//evil.example.com/x\u003c/code\u003e, sending the request and the credentials from \u003ccode\u003eTypedControllerConfig\u003c/code\u003e to an attacker-controlled host. Nothing constrains the value at runtime: \u003ccode\u003eget_path_param_type/2\u003c/code\u003e emits only a TypeScript type, which is erased.\u003c/p\u003e\n\u003cp\u003eThe query-string path is unaffected, since \u003ccode\u003eURLSearchParams.set\u003c/code\u003e encodes its own values.\u003c/p\u003e\n\u003cp\u003eThis issue affects ash_typescript: from 0.15.0 before 0.18.0.\u003c/p\u003e"
            },
            {
              "base64": false,
              "type": "text/markdown",
              "value": "URL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in ash-project ash_typescript allows an attacker who controls a path-parameter value to redirect a generated client\u0027s request, and the credentials attached to it, to an unintended route or an external origin.\n\nThe URL builders in `lib/ash_typescript/typed_controller/codegen/route_renderer.ex` replace each `:param` placeholder with a bare template interpolation and never call `encodeURIComponent`, so the value reaches `executeTypedControllerRequest` raw. A value containing `../` is normalised away by the fetch URL resolver and reaches a different route, while `?` or `#` truncates the path and can smuggle or override query parameters. For a route whose path begins with a parameter, a value such as `/evil.example.com/x` yields the protocol-relative URL `//evil.example.com/x`, sending the request and the credentials from `TypedControllerConfig` to an attacker-controlled host. Nothing constrains the value at runtime: `get_path_param_type/2` emits only a TypeScript type, which is erased.\n\nThe query-string path is unaffected, since `URLSearchParams.set` encodes its own values.\n\nThis issue affects ash_typescript: from 0.15.0 before 0.18.0."
            }
          ],
          "value": "URL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in ash-project ash_typescript allows an attacker who controls a path-parameter value to redirect a generated client\u0027s request, and the credentials attached to it, to an unintended route or an external origin.\n\nThe URL builders in lib/ash_typescript/typed_controller/codegen/route_renderer.ex replace each :param placeholder with a bare template interpolation and never call encodeURIComponent, so the value reaches executeTypedControllerRequest raw. A value containing ../ is normalised away by the fetch URL resolver and reaches a different route, while ? or # truncates the path and can smuggle or override query parameters. For a route whose path begins with a parameter, a value such as /evil.example.com/x yields the protocol-relative URL //evil.example.com/x, sending the request and the credentials from TypedControllerConfig to an attacker-controlled host. Nothing constrains the value at runtime: get_path_param_type/2 emits only a TypeScript type, which is erased.\n\nThe query-string path is unaffected, since URLSearchParams.set encodes its own values.\n\nThis issue affects ash_typescript: from 0.15.0 before 0.18.0."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-72",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-72 URL Encoding"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 2.3,
            "baseSeverity": "LOW",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-601",
              "description": "CWE-601 URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-01T02:09:38.801Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
      },
      "references": [
        {
          "tags": [
            "related",
            "vendor-advisory"
          ],
          "url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://cna.erlef.org/cves/CVE-2026-82731.html"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82731"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/ash-project/ash_typescript/commit/5165f752f5f92b755d946f2d1ce750ff69083ffc"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Unescaped path parameters in AshTypescript generated TypeScript client allow request redirection"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
    "assignerShortName": "EEF",
    "cveId": "CVE-2026-82731",
    "datePublished": "2026-09-01T02:09:38.801Z",
    "dateReserved": "2026-08-31T00:59:08.960Z",
    "dateUpdated": "2026-09-01T15:13:54.605Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-82731",
      "date": "2026-09-02",
      "epss": "0.00288",
      "percentile": "0.20909"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-82731\",\"sourceIdentifier\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"published\":\"2026-09-01T03:16:52.993\",\"lastModified\":\"2026-09-01T21:15:00.147\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"URL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in ash-project ash_typescript allows an attacker who controls a path-parameter value to redirect a generated client\u0027s request, and the credentials attached to it, to an unintended route or an external origin.\\n\\nThe URL builders in lib/ash_typescript/typed_controller/codegen/route_renderer.ex replace each :param placeholder with a bare template interpolation and never call encodeURIComponent, so the value reaches executeTypedControllerRequest raw. A value containing ../ is normalised away by the fetch URL resolver and reaches a different route, while ? or # truncates the path and can smuggle or override query parameters. For a route whose path begins with a parameter, a value such as /evil.example.com/x yields the protocol-relative URL //evil.example.com/x, sending the request and the credentials from TypedControllerConfig to an attacker-controlled host. Nothing constrains the value at runtime: get_path_param_type/2 emits only a TypeScript type, which is erased.\\n\\nThe query-string path is unaffected, since URLSearchParams.set encodes its own values.\\n\\nThis issue affects ash_typescript: from 0.15.0 before 0.18.0.\"}],\"affected\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"affectedData\":[{\"vendor\":\"ash-project\",\"product\":\"ash_typescript\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://repo.hex.pm\",\"packageName\":\"ash_typescript\",\"cpes\":[\"cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027\"],\"programFiles\":[\"lib/ash_typescript/typed_controller/codegen/route_renderer.ex\"],\"programRoutines\":[{\"name\":\"\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027:build_url_template_to_variable/4\"}],\"repo\":\"https://github.com/ash-project/ash_typescript\",\"packageURL\":\"pkg:hex/ash_typescript\",\"versions\":[{\"version\":\"0.15.0\",\"lessThan\":\"0.18.0\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"ash-project\",\"product\":\"ash_typescript\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://github.com\",\"packageName\":\"ash-project/ash_typescript\",\"cpes\":[\"cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027\"],\"programFiles\":[\"lib/ash_typescript/typed_controller/codegen/route_renderer.ex\"],\"programRoutines\":[{\"name\":\"\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027:build_url_template_to_variable/4\"}],\"repo\":\"https://github.com/ash-project/ash_typescript\",\"packageURL\":\"pkg:github/ash-project/ash_typescript\",\"versions\":[{\"version\":\"6669e22ece34b4534e706a46d1842f01b68ee23a\",\"lessThan\":\"5165f752f5f92b755d946f2d1ce750ff69083ffc\",\"versionType\":\"git\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":2.3,\"baseSeverity\":\"LOW\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"PASSIVE\",\"vulnConfidentialityImpact\":\"LOW\",\"vulnIntegrityImpact\":\"LOW\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"LOW\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-09-01T15:13:34.848553Z\",\"id\":\"CVE-2026-82731\",\"options\":[{\"exploitation\":\"poc\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-601\"}]}],\"references\":[{\"url\":\"https://cna.erlef.org/cves/CVE-2026-82731.html\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/ash-project/ash_typescript/commit/5165f752f5f92b755d946f2d1ce750ff69083ffc\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://osv.dev/vulnerability/EEF-CVE-2026-82731\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-82731\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-01T15:13:34.848553Z\"}}}], \"references\": [{\"url\": \"https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-01T15:13:50.085Z\"}}], \"cna\": {\"title\": \"Unescaped path parameters in AshTypescript generated TypeScript client allow request redirection\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Peter Ullrich\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Peter Ullrich\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Torkild Gundersen Kjevik / Ash Project\"}, {\"lang\": \"en\", \"type\": \"coordinator\", \"value\": \"Jonatan M\\u00e4nnchen / EEF\"}], \"impacts\": [{\"capecId\": \"CAPEC-72\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-72 URL Encoding\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 2.3, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"PASSIVE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"LOW\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"LOW\", \"vulnConfidentialityImpact\": \"LOW\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/ash-project/ash_typescript\", \"vendor\": \"ash-project\", \"modules\": [\"\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027\"], \"product\": \"ash_typescript\", \"versions\": [{\"status\": \"affected\", \"version\": \"0.15.0\", \"lessThan\": \"0.18.0\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/ash_typescript\", \"packageName\": \"ash_typescript\", \"programFiles\": [\"lib/ash_typescript/typed_controller/codegen/route_renderer.ex\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027:build_url_template_to_variable/4\"}]}, {\"cpes\": [\"cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/ash-project/ash_typescript\", \"vendor\": \"ash-project\", \"modules\": [\"\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027\"], \"product\": \"ash_typescript\", \"versions\": [{\"status\": \"affected\", \"version\": \"6669e22ece34b4534e706a46d1842f01b68ee23a\", \"lessThan\": \"5165f752f5f92b755d946f2d1ce750ff69083ffc\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/ash-project/ash_typescript\", \"packageName\": \"ash-project/ash_typescript\", \"programFiles\": [\"lib/ash_typescript/typed_controller/codegen/route_renderer.ex\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027:build_url_template_to_variable/4\"}]}], \"references\": [{\"url\": \"https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f\", \"tags\": [\"related\", \"vendor-advisory\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-82731.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-82731\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/ash-project/ash_typescript/commit/5165f752f5f92b755d946f2d1ce750ff69083ffc\", \"tags\": [\"patch\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"URL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in ash-project ash_typescript allows an attacker who controls a path-parameter value to redirect a generated client\u0027s request, and the credentials attached to it, to an unintended route or an external origin.\\n\\nThe URL builders in lib/ash_typescript/typed_controller/codegen/route_renderer.ex replace each :param placeholder with a bare template interpolation and never call encodeURIComponent, so the value reaches executeTypedControllerRequest raw. A value containing ../ is normalised away by the fetch URL resolver and reaches a different route, while ? or # truncates the path and can smuggle or override query parameters. For a route whose path begins with a parameter, a value such as /evil.example.com/x yields the protocol-relative URL //evil.example.com/x, sending the request and the credentials from TypedControllerConfig to an attacker-controlled host. Nothing constrains the value at runtime: get_path_param_type/2 emits only a TypeScript type, which is erased.\\n\\nThe query-string path is unaffected, since URLSearchParams.set encodes its own values.\\n\\nThis issue affects ash_typescript: from 0.15.0 before 0.18.0.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eURL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in ash-project ash_typescript allows an attacker who controls a path-parameter value to redirect a generated client\u0027s request, and the credentials attached to it, to an unintended route or an external origin.\u003c/p\u003e\\n\u003cp\u003eThe URL builders in \u003ccode\u003elib/ash_typescript/typed_controller/codegen/route_renderer.ex\u003c/code\u003e replace each \u003ccode\u003e:param\u003c/code\u003e placeholder with a bare template interpolation and never call \u003ccode\u003eencodeURIComponent\u003c/code\u003e, so the value reaches \u003ccode\u003eexecuteTypedControllerRequest\u003c/code\u003e raw. A value containing \u003ccode\u003e../\u003c/code\u003e is normalised away by the fetch URL resolver and reaches a different route, while \u003ccode\u003e?\u003c/code\u003e or \u003ccode\u003e#\u003c/code\u003e truncates the path and can smuggle or override query parameters. For a route whose path begins with a parameter, a value such as \u003ccode\u003e/evil.example.com/x\u003c/code\u003e yields the protocol-relative URL \u003ccode\u003e//evil.example.com/x\u003c/code\u003e, sending the request and the credentials from \u003ccode\u003eTypedControllerConfig\u003c/code\u003e to an attacker-controlled host. Nothing constrains the value at runtime: \u003ccode\u003eget_path_param_type/2\u003c/code\u003e emits only a TypeScript type, which is erased.\u003c/p\u003e\\n\u003cp\u003eThe query-string path is unaffected, since \u003ccode\u003eURLSearchParams.set\u003c/code\u003e encodes its own values.\u003c/p\u003e\\n\u003cp\u003eThis issue affects ash_typescript: from 0.15.0 before 0.18.0.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"URL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in ash-project ash_typescript allows an attacker who controls a path-parameter value to redirect a generated client\u0027s request, and the credentials attached to it, to an unintended route or an external origin.\\n\\nThe URL builders in `lib/ash_typescript/typed_controller/codegen/route_renderer.ex` replace each `:param` placeholder with a bare template interpolation and never call `encodeURIComponent`, so the value reaches `executeTypedControllerRequest` raw. A value containing `../` is normalised away by the fetch URL resolver and reaches a different route, while `?` or `#` truncates the path and can smuggle or override query parameters. For a route whose path begins with a parameter, a value such as `/evil.example.com/x` yields the protocol-relative URL `//evil.example.com/x`, sending the request and the credentials from `TypedControllerConfig` to an attacker-controlled host. Nothing constrains the value at runtime: `get_path_param_type/2` emits only a TypeScript type, which is erased.\\n\\nThe query-string path is unaffected, since `URLSearchParams.set` encodes its own values.\\n\\nThis issue affects ash_typescript: from 0.15.0 before 0.18.0.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-601\", \"description\": \"CWE-601 URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The application ships a TypeScript client generated by AshTypescript for a typed-controller route taking a path parameter, and passes untrusted input as that parameter.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe application ships a TypeScript client generated by AshTypescript for a typed-controller route taking a path parameter, and passes untrusted input as that parameter.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"The application ships a TypeScript client generated by AshTypescript for a typed-controller route taking a path parameter, and passes untrusted input as that parameter.\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"0.18.0\", \"versionStartIncluding\": \"0.15.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-09-01T02:09:38.801Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-82731\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-01T15:13:54.605Z\", \"dateReserved\": \"2026-08-31T00:59:08.960Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-09-01T02:09:38.801Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-82731

Vulnerability from fkie_nvd - Published: 2026-09-01 03:16 - Updated: 2026-09-01 21:15

Severity

2.3 (Low) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N

Summary

References

	URL	Tags
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://cna.erlef.org/cves/CVE-2026-82731.html
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ash-project/ash_typescript/commit/5165f752f5f92b755d946f2d1ce750ff69083ffc
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://osv.dev/vulnerability/EEF-CVE-2026-82731
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027"
          ],
          "packageName": "ash_typescript",
          "packageURL": "pkg:hex/ash_typescript",
          "product": "ash_typescript",
          "programFiles": [
            "lib/ash_typescript/typed_controller/codegen/route_renderer.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027:build_url_template_to_variable/4"
            }
          ],
          "repo": "https://github.com/ash-project/ash_typescript",
          "vendor": "ash-project",
          "versions": [
            {
              "lessThan": "0.18.0",
              "status": "affected",
              "version": "0.15.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027"
          ],
          "packageName": "ash-project/ash_typescript",
          "packageURL": "pkg:github/ash-project/ash_typescript",
          "product": "ash_typescript",
          "programFiles": [
            "lib/ash_typescript/typed_controller/codegen/route_renderer.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.AshTypescript.TypedController.Codegen.RouteRenderer\u0027:build_url_template_to_variable/4"
            }
          ],
          "repo": "https://github.com/ash-project/ash_typescript",
          "vendor": "ash-project",
          "versions": [
            {
              "lessThan": "5165f752f5f92b755d946f2d1ce750ff69083ffc",
              "status": "affected",
              "version": "6669e22ece34b4534e706a46d1842f01b68ee23a",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "URL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in ash-project ash_typescript allows an attacker who controls a path-parameter value to redirect a generated client\u0027s request, and the credentials attached to it, to an unintended route or an external origin.\n\nThe URL builders in lib/ash_typescript/typed_controller/codegen/route_renderer.ex replace each :param placeholder with a bare template interpolation and never call encodeURIComponent, so the value reaches executeTypedControllerRequest raw. A value containing ../ is normalised away by the fetch URL resolver and reaches a different route, while ? or # truncates the path and can smuggle or override query parameters. For a route whose path begins with a parameter, a value such as /evil.example.com/x yields the protocol-relative URL //evil.example.com/x, sending the request and the credentials from TypedControllerConfig to an attacker-controlled host. Nothing constrains the value at runtime: get_path_param_type/2 emits only a TypeScript type, which is erased.\n\nThe query-string path is unaffected, since URLSearchParams.set encodes its own values.\n\nThis issue affects ash_typescript: from 0.15.0 before 0.18.0."
    }
  ],
  "id": "CVE-2026-82731",
  "lastModified": "2026-09-01T21:15:00.147",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 2.3,
          "baseSeverity": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "NONE",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-82731",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-01T15:13:34.848553Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-01T03:16:52.993",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-82731.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ash-project/ash_typescript/commit/5165f752f5f92b755d946f2d1ce750ff69083ffc"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82731"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-601"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-82731 (GCVE-0-2026-82731)

FKIE_CVE-2026-82731

Tags

Sightings

Nomenclature