Vulnerability-Lookup

CVE-2026-89420 (GCVE-0-2026-89420)

Vulnerability from cvelistv5 – Published: 2026-09-22 11:16 – Updated: 2026-09-22 12:04

Title

Session voucher adding no new funds is accepted without a charge in mpp, serving paid resources for free

Summary

Improper Validation of Specified Quantity in Input in ZenHive mpp allows a client holding an open payment channel to obtain paid resources without being charged. MPP.Session.Actions.accept_voucher/3 in lib/mpp/session/actions.ex treats a voucher whose cumulativeAmount equals the channel's already-accepted cumulative amount as an idempotent success, returning the channel unchanged without calling maybe_spend/2. The credential verifies, the protected resource is served, and spent and units stay where they were. Because the server issues a fresh challenge per request and the credential replay store keys on challenge id and payload, the same signed voucher can be re-presented under every new challenge, so one paid voucher yields an unbounded number of paid units. The path is reachable from any method built on MPP.Session.Method through the Plug, MCP, JSON-RPC and WebSocket transports. This issue affects mpp: from 0.14.0 before 0.16.2.

Severity

7.1 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-22 12:03 UTC

CWE

CWE-1284 - Improper Validation of Specified Quantity in Input

Assigner

EEF CNA under the mitre root

CNA scorecard A 97/100 over 357 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/ZenHive/mpp/security/advisorie…	relatedvendor-advisory
https://cna.erlef.org/cves/CVE-2026-89420.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-89420	related
https://github.com/ZenHive/mpp/commit/82df569c898…	related
https://github.com/ZenHive/mpp/commit/7270edc1dcf…	patch

Impacted products

2 products

Vendor	Product	Version	CPE status
ZenHive	mpp	Affected: 0.14.0 , < 0.16.2 (semver) cpe:2.3:a:ZenHive:mpp::::::::
ZenHive	mpp	Affected: 82df569c898be1137189e3648e1edb4af6363651 , < 7270edc1dcfb58250cc5ee812876609206564165 (git) cpe:2.3:a:ZenHive:mpp::::::::

Credits

E.FU E.FU Jonatan Männchen / EEF

Show details on NVD website

JSON

To clipboard

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            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "collectionURL": "https://repo.hex.pm",
              "cpes": [
                "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
              ],
              "defaultStatus": "unaffected",
              "modules": [
                "\u0027Elixir.MPP.Session.Actions\u0027"
              ],
              "packageName": "mpp",
              "packageURL": "pkg:hex/mpp",
              "product": "mpp",
              "programFiles": [
                "lib/mpp/session/actions.ex"
              ],
              "programRoutines": [
                {
                  "name": "\u0027Elixir.MPP.Session.Actions\u0027:dispatch/2"
                },
                {
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                }
              ],
              "repo": "https://github.com/ZenHive/mpp",
              "vendor": "ZenHive",
              "versions": [
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                  "status": "affected",
                  "version": "0.14.0",
                  "versionType": "semver"
                }
              ]
            },
            {
              "collectionURL": "https://github.com",
              "cpes": [
                "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
              ],
              "defaultStatus": "unaffected",
              "modules": [
                "\u0027Elixir.MPP.Session.Actions\u0027"
              ],
              "packageName": "zenhive/mpp",
              "packageURL": "pkg:github/zenhive/mpp",
              "product": "mpp",
              "programFiles": [
                "lib/mpp/session/actions.ex"
              ],
              "programRoutines": [
                {
                  "name": "\u0027Elixir.MPP.Session.Actions\u0027:dispatch/2"
                },
                {
                  "name": "\u0027Elixir.MPP.Session.Actions\u0027:handle/2"
                }
              ],
              "repo": "https://github.com/ZenHive/mpp",
              "vendor": "ZenHive",
              "versions": [
                {
                  "lessThan": "7270edc1dcfb58250cc5ee812876609206564165",
                  "status": "affected",
                  "version": "82df569c898be1137189e3648e1edb4af6363651",
                  "versionType": "git"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "0.16.2",
                      "versionStartIncluding": "0.14.0",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ],
              "operator": "AND"
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "E.FU"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "E.FU"
            },
            {
              "lang": "en",
              "type": "coordinator",
              "value": "Jonatan M\u00e4nnchen / EEF"
            }
          ],
          "dateAssigned": "2026-09-15T15:23:05.000Z",
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eImproper Validation of Specified Quantity in Input in ZenHive mpp allows a client holding an open payment channel to obtain paid resources without being charged.\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eMPP.Session.Actions.accept_voucher/3\u003c/code\u003e in \u003ccode\u003elib/mpp/session/actions.ex\u003c/code\u003e treats a voucher whose \u003ccode\u003ecumulativeAmount\u003c/code\u003e equals the channel\u0027s already-accepted cumulative amount as an idempotent success, returning the channel unchanged without calling \u003ccode\u003emaybe_spend/2\u003c/code\u003e. The credential verifies, the protected resource is served, and \u003ccode\u003espent\u003c/code\u003e and \u003ccode\u003eunits\u003c/code\u003e stay where they were. Because the server issues a fresh challenge per request and the credential replay store keys on challenge id and payload, the same signed voucher can be re-presented under every new challenge, so one paid voucher yields an unbounded number of paid units. The path is reachable from any method built on \u003ccode\u003eMPP.Session.Method\u003c/code\u003e through the Plug, MCP, JSON-RPC and WebSocket transports.\u003c/p\u003e\n\u003cp\u003eThis issue affects mpp: from 0.14.0 before 0.16.2.\u003c/p\u003e"
                },
                {
                  "base64": false,
                  "type": "text/markdown",
                  "value": "Improper Validation of Specified Quantity in Input in ZenHive mpp allows a client holding an open payment channel to obtain paid resources without being charged.\n\n`MPP.Session.Actions.accept_voucher/3` in `lib/mpp/session/actions.ex` treats a voucher whose `cumulativeAmount` equals the channel\u0027s already-accepted cumulative amount as an idempotent success, returning the channel unchanged without calling `maybe_spend/2`. The credential verifies, the protected resource is served, and `spent` and `units` stay where they were. Because the server issues a fresh challenge per request and the credential replay store keys on challenge id and payload, the same signed voucher can be re-presented under every new challenge, so one paid voucher yields an unbounded number of paid units. The path is reachable from any method built on `MPP.Session.Method` through the Plug, MCP, JSON-RPC and WebSocket transports.\n\nThis issue affects mpp: from 0.14.0 before 0.16.2."
                }
              ],
              "value": "Improper Validation of Specified Quantity in Input in ZenHive mpp allows a client holding an open payment channel to obtain paid resources without being charged.\n\nMPP.Session.Actions.accept_voucher/3 in lib/mpp/session/actions.ex treats a voucher whose cumulativeAmount equals the channel\u0027s already-accepted cumulative amount as an idempotent success, returning the channel unchanged without calling maybe_spend/2. The credential verifies, the protected resource is served, and spent and units stay where they were. Because the server issues a fresh challenge per request and the credential replay store keys on challenge id and payload, the same signed voucher can be re-presented under every new challenge, so one paid voucher yields an unbounded number of paid units. The path is reachable from any method built on MPP.Session.Method through the Plug, MCP, JSON-RPC and WebSocket transports.\n\nThis issue affects mpp: from 0.14.0 before 0.16.2."
            }
          ],
          "impacts": [
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              "capecId": "CAPEC-212",
              "descriptions": [
                {
                  "lang": "en",
                  "supportingMedia": [
                    {
                      "base64": false,
                      "type": "text/html",
                      "value": "\u003cp\u003eA client that has opened and funded a payment channel once can re-present the same signed voucher indefinitely and receive paid resources without any further charge. Operators running mpp as paid-API middleware lose revenue in proportion to how much the client consumes, with nothing in the channel state recording the usage.\u003c/p\u003e"
                    },
                    {
                      "base64": false,
                      "type": "text/markdown",
                      "value": "A client that has opened and funded a payment channel once can re-present the same signed voucher indefinitely and receive paid resources without any further charge. Operators running mpp as paid-API middleware lose revenue in proportion to how much the client consumes, with nothing in the channel state recording the usage."
                    }
                  ],
                  "value": "A client that has opened and funded a payment channel once can re-present the same signed voucher indefinitely and receive paid resources without any further charge. Operators running mpp as paid-API middleware lose revenue in proportion to how much the client consumes, with nothing in the channel state recording the usage."
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "privilegesRequired": "LOW",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-1284",
                  "description": "CWE-1284 Improper Validation of Specified Quantity in Input",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-22T11:16:29.573Z",
            "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "shortName": "EEF"
          },
          "references": [
            {
              "name": "GitHub Advisory",
              "tags": [
                "related",
                "vendor-advisory"
              ],
              "url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-8c63-r789-xrrf"
            },
            {
              "name": "EEF CNA record for CVE-2026-89420",
              "tags": [
                "related"
              ],
              "url": "https://cna.erlef.org/cves/CVE-2026-89420.html"
            },
            {
              "name": "OSV record EEF-CVE-2026-89420",
              "tags": [
                "related"
              ],
              "url": "https://osv.dev/vulnerability/EEF-CVE-2026-89420"
            },
            {
              "name": "Introducing commit 82df569 in ZenHive/mpp",
              "tags": [
                "related"
              ],
              "url": "https://github.com/ZenHive/mpp/commit/82df569c898be1137189e3648e1edb4af6363651"
            },
            {
              "name": "Fix commit 7270edc in ZenHive/mpp",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/ZenHive/mpp/commit/7270edc1dcfb58250cc5ee812876609206564165"
            }
          ],
          "source": {
            "discovery": "INTERNAL"
          },
          "title": "Session voucher adding no new funds is accepted without a charge in mpp, serving paid resources for free"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "assignerShortName": "EEF",
        "cveId": "CVE-2026-89420",
        "datePublished": "2026-09-22T11:16:29.573Z",
        "dateReserved": "2026-09-11T19:00:02.531Z",
        "dateUpdated": "2026-09-22T12:04:43.291Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-89420

Vulnerability from fkie_nvd - Published: 2026-09-22 12:17 - Updated: 2026-09-22 19:09

Severity

7.1 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://cna.erlef.org/cves/CVE-2026-89420.html
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ZenHive/mpp/commit/7270edc1dcfb58250cc5ee812876609206564165
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ZenHive/mpp/commit/82df569c898be1137189e3648e1edb4af6363651
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ZenHive/mpp/security/advisories/GHSA-8c63-r789-xrrf
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://osv.dev/vulnerability/EEF-CVE-2026-89420
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/ZenHive/mpp/security/advisories/GHSA-8c63-r789-xrrf

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.MPP.Session.Actions\u0027"
          ],
          "packageName": "mpp",
          "packageURL": "pkg:hex/mpp",
          "product": "mpp",
          "programFiles": [
            "lib/mpp/session/actions.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.MPP.Session.Actions\u0027:dispatch/2"
            },
            {
              "name": "\u0027Elixir.MPP.Session.Actions\u0027:handle/2"
            }
          ],
          "repo": "https://github.com/ZenHive/mpp",
          "vendor": "ZenHive",
          "versions": [
            {
              "lessThan": "0.16.2",
              "status": "affected",
              "version": "0.14.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.MPP.Session.Actions\u0027"
          ],
          "packageName": "zenhive/mpp",
          "packageURL": "pkg:github/zenhive/mpp",
          "product": "mpp",
          "programFiles": [
            "lib/mpp/session/actions.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.MPP.Session.Actions\u0027:dispatch/2"
            },
            {
              "name": "\u0027Elixir.MPP.Session.Actions\u0027:handle/2"
            }
          ],
          "repo": "https://github.com/ZenHive/mpp",
          "vendor": "ZenHive",
          "versions": [
            {
              "lessThan": "7270edc1dcfb58250cc5ee812876609206564165",
              "status": "affected",
              "version": "82df569c898be1137189e3648e1edb4af6363651",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper Validation of Specified Quantity in Input in ZenHive mpp allows a client holding an open payment channel to obtain paid resources without being charged.\n\nMPP.Session.Actions.accept_voucher/3 in lib/mpp/session/actions.ex treats a voucher whose cumulativeAmount equals the channel\u0027s already-accepted cumulative amount as an idempotent success, returning the channel unchanged without calling maybe_spend/2. The credential verifies, the protected resource is served, and spent and units stay where they were. Because the server issues a fresh challenge per request and the credential replay store keys on challenge id and payload, the same signed voucher can be re-presented under every new challenge, so one paid voucher yields an unbounded number of paid units. The path is reachable from any method built on MPP.Session.Method through the Plug, MCP, JSON-RPC and WebSocket transports.\n\nThis issue affects mpp: from 0.14.0 before 0.16.2."
    }
  ],
  "id": "CVE-2026-89420",
  "lastModified": "2026-09-22T19:09:32.273",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "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": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/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": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-89420",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-22T12:03:58.968313Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-22T12:17:14.370",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-89420.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ZenHive/mpp/commit/7270edc1dcfb58250cc5ee812876609206564165"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ZenHive/mpp/commit/82df569c898be1137189e3648e1edb4af6363651"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-8c63-r789-xrrf"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-89420"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-8c63-r789-xrrf"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1284"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}

GHSA-96M7-5WFV-978M

Vulnerability from github – Published: 2026-09-22 12:30 – Updated: 2026-09-22 12:30

Details

Improper Validation of Specified Quantity in Input in ZenHive mpp allows a client holding an open payment channel to obtain paid resources without being charged.

MPP.Session.Actions.accept_voucher/3 in lib/mpp/session/actions.ex treats a voucher whose cumulativeAmount equals the channel's already-accepted cumulative amount as an idempotent success, returning the channel unchanged without calling maybe_spend/2. The credential verifies, the protected resource is served, and spent and units stay where they were. Because the server issues a fresh challenge per request and the credential replay store keys on challenge id and payload, the same signed voucher can be re-presented under every new challenge, so one paid voucher yields an unbounded number of paid units. The path is reachable from any method built on MPP.Session.Method through the Plug, MCP, JSON-RPC and WebSocket transports.

This issue affects mpp: from 0.14.0 before 0.16.2.

Severity

7.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-89420"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1284"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-22T12:17:14Z",
    "severity": "HIGH"
  },
  "details": "Improper Validation of Specified Quantity in Input in ZenHive mpp allows a client holding an open payment channel to obtain paid resources without being charged.\n\nMPP.Session.Actions.accept_voucher/3 in lib/mpp/session/actions.ex treats a voucher whose cumulativeAmount equals the channel\u0027s already-accepted cumulative amount as an idempotent success, returning the channel unchanged without calling maybe_spend/2. The credential verifies, the protected resource is served, and spent and units stay where they were. Because the server issues a fresh challenge per request and the credential replay store keys on challenge id and payload, the same signed voucher can be re-presented under every new challenge, so one paid voucher yields an unbounded number of paid units. The path is reachable from any method built on MPP.Session.Method through the Plug, MCP, JSON-RPC and WebSocket transports.\n\nThis issue affects mpp: from 0.14.0 before 0.16.2.",
  "id": "GHSA-96m7-5wfv-978m",
  "modified": "2026-09-22T12:30:26Z",
  "published": "2026-09-22T12:30:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-8c63-r789-xrrf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89420"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ZenHive/mpp/commit/7270edc1dcfb58250cc5ee812876609206564165"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ZenHive/mpp/commit/82df569c898be1137189e3648e1edb4af6363651"
    },
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-89420.html"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-89420"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/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"
    }
  ]
}

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

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-89420 (GCVE-0-2026-89420)

FKIE_CVE-2026-89420

GHSA-96M7-5WFV-978M

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour