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CVE-2021-39904

Status: ModifiedMedium (4.3)—

An Improper Access Control vulnerability in the GraphQL API in all versions of GitLab CE/EE starting from 13.1 before 14.2.6, all versions starting from 14.3 before 14.3.4, and all versions starting from 14.4 before 14.4.1 allows a Merge Request creator to resolve discussions and apply suggestions after a project owner has locked the Merge Request

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Gitlab — Gitlab

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-39904",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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        "type": "Secondary",
        "source": "cve@gitlab.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 2.8
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "integrityImpact": "LOW",
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          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
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          "confidentialityImpact": "NONE"
        },
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  "affected": [
    {
      "source": "cve@gitlab.com",
      "affectedData": [
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          "product": "GitLab",
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            {
              "status": "affected",
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              "status": "affected",
              "version": ">=14.3, <14.3.4"
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  ],
  "published": "2021-11-05T00:15:10.847",
  "references": [
    {
      "url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39904.json",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@gitlab.com"
    },
    {
      "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/295298",
      "tags": [
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        "Issue Tracking",
        "Vendor Advisory"
      ],
      "source": "cve@gitlab.com"
    },
    {
      "url": "https://hackerone.com/reports/1063420",
      "tags": [
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      "source": "cve@gitlab.com"
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    {
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
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      "tags": [
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        "Issue Tracking",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
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      "url": "https://hackerone.com/reports/1063420",
      "tags": [
        "Permissions Required",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An Improper Access Control vulnerability in the GraphQL API in all versions of GitLab CE/EE starting from 13.1 before 14.2.6, all versions starting from 14.3 before 14.3.4, and all versions starting from 14.4 before 14.4.1 allows a Merge Request creator to resolve discussions and apply suggestions after a project owner has locked the Merge Request"
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de control de acceso inadecuado en la API GraphQL en todas las versiones de GitLab CE/EE a partir de la 13.1 antes de la 14.2.6, en todas las versiones a partir de la 14.3 antes de la 14.3.4 y en todas las versiones a partir de la 14.4 antes de la 14.4.1 permite a un creador de solicitudes de fusión resolver debates y aplicar sugerencias después de que el propietario de un proyecto haya bloqueado la solicitud de fusión"
    }
  ],
  "lastModified": "2026-06-17T04:04:23.890",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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}