Vulnerability-Lookup

GHSA-8P5C-VR7C-5G49

Vulnerability from github – Published: 2026-10-14 15:32 – Updated: 2026-10-14 15:32

Details

Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request forgery vulnerability in the /api/download/attatchment route due to an incomplete fix for CVE-2026-32255. When S3_ENDPOINT is unset, attackers can pass arbitrary url query parameters to fetch() to read internal services, localhost ports, and cloud instance metadata.

Severity

8.6 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

9.2 (Critical)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-110628"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-14T15:17:15Z",
    "severity": "CRITICAL"
  },
  "details": "Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request forgery vulnerability in the /api/download/attatchment route due to an incomplete fix for CVE-2026-32255. When S3_ENDPOINT is unset, attackers can pass arbitrary url query parameters to fetch() to read internal services, localhost ports, and cloud instance metadata.",
  "id": "GHSA-8p5c-vr7c-5g49",
  "modified": "2026-10-14T15:32:26Z",
  "published": "2026-10-14T15:32:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-110628"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kanbn/kan/pull/590"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kanbn/kan"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kanbn/kan/blob/v0.6.0/.env.example#L25-L27"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts#L21-L52"
    },
    {
      "type": "WEB",
      "url": "https://hackmd.io/@leediay/HyIxU63ofg"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchment"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-110628 (GCVE-0-2026-110628)

Vulnerability from cvelistv5 – Published: 2026-10-14 14:17 – Updated: 2026-10-16 17:16

Title

Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment

Summary

Severity

9.2 (Critical)


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

8.6 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-16 16:46 UTC

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6373 records in the last 180 days details

References

8 references

URL	Tags
https://hackmd.io/@leediay/HyIxU63ofg	third-party-advisory
https://github.com/kanbn/kan/pull/590	issue-trackingpatch
https://github.com/kanbn/kan/blob/v0.6.0/apps/web…	technical-description
https://github.com/kanbn/kan/blob/v0.6.0/.env.exa…	technical-description
https://github.com/kanbn/kan/security/advisories/…	vendor-advisory
https://github.com/kanbn/kan/commit/53397d8e81dc1…	patch
https://github.com/kanbn/kan	product
https://www.vulncheck.com/advisories/kan-0.5.5-th…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
kanbn	kan	Affected: 0.5.5 , ≤ 0.6.0 (semver) cpe:2.3:a:kan:kan::::::::

Date Public

2026-09-05 00:00

Credits

leediay153 from Viettel Post

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-110628",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T16:46:50.369655Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-16T17:16:01.554Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com",
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/kanbn/kan",
          "product": "kan",
          "repo": "https://github.com/kanbn/kan",
          "vendor": "kanbn",
          "versions": [
            {
              "lessThanOrEqual": "0.6.0",
              "status": "affected",
              "version": "0.5.5",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:kan:kan:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "0.6.0",
                  "versionStartIncluding": "0.5.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "leediay153 from Viettel Post"
        }
      ],
      "datePublic": "2026-09-05T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
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        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 9.2,
            "baseSeverity": "CRITICAL",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.1"
          },
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          "descriptions": [
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              "cweId": "CWE-918",
              "description": "Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-14T14:17:03.232Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://hackmd.io/@leediay/HyIxU63ofg"
        },
        {
          "name": "Open PR describing the S3_ENDPOINT-unset bypass",
          "tags": [
            "issue-tracking",
            "patch"
          ],
          "url": "https://github.com/kanbn/kan/pull/590"
        },
        {
          "name": "allowlist conditional on S3_ENDPOINT, unconditional fetch(url)",
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts#L21-L52"
        },
        {
          "name": "S3_ENDPOINT documented as blank for AWS S3",
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/kanbn/kan/blob/v0.6.0/.env.example#L25-L27"
        },
        {
          "name": "GitHub Security Advisory (GHSA-qrx8-9hc6-jvqg)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg"
        },
        {
          "name": "Incomplete fix for CVE-2026-32255",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/kanbn/kan"
        },
        {
          "name": "VulnCheck Advisory: Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchment"
        }
      ],
      "title": "Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-110628",
    "datePublished": "2026-10-14T14:17:03.232Z",
    "dateReserved": "2026-10-14T13:07:29.410Z",
    "dateUpdated": "2026-10-16T17:16:01.554Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

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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.
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