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CVE-2021-22242

Estado: ModificadaMedia (5.4)—

Un saneo de entradas insuficiente en el markdown de Mermaid en GitLab CE/EE versión 11.4 y superiores, permite a un atacante explotar una vulnerabilidad de tipo cross-site scripting almacenado por medio de un markdown especialmente diseñado

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Gitlab — Gitlab

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-22242",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 3.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:S/C:N/I:P/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "cve@gitlab.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 8.7,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.8,
        "exploitabilityScore": 2.3
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 5.4,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.3
      }
    ]
  },
  "affected": [
    {
      "source": "cve@gitlab.com",
      "affectedData": [
        {
          "vendor": "GitLab",
          "product": "GitLab",
          "versions": [
            {
              "status": "affected",
              "version": ">=11.4, <13.12.9"
            },
            {
              "status": "affected",
              "version": ">=14.0, <14.0.7"
            },
            {
              "status": "affected",
              "version": ">=14.1, <14.1.2"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-08-25T19:15:10.750",
  "references": [
    {
      "url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22242.json",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@gitlab.com"
    },
    {
      "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/332528",
      "tags": [
        "Broken Link"
      ],
      "source": "cve@gitlab.com"
    },
    {
      "url": "https://hackerone.com/reports/1212822",
      "tags": [
        "Permissions Required",
        "Third Party Advisory"
      ],
      "source": "cve@gitlab.com"
    },
    {
      "url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22242.json",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/332528",
      "tags": [
        "Broken Link"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://hackerone.com/reports/1212822",
      "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-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Insufficient input sanitization in Mermaid markdown in GitLab CE/EE version 11.4 and up allows an attacker to exploit a stored cross-site scripting vulnerability via a specially-crafted markdown"
    },
    {
      "lang": "es",
      "value": "Un saneo de entradas insuficiente en el markdown de Mermaid en GitLab CE/EE versión 11.4 y superiores, permite a un atacante explotar una vulnerabilidad de tipo cross-site scripting almacenado por medio de un markdown especialmente diseñado"
    }
  ],
  "lastModified": "2026-06-17T03:36:52.287",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4DDEA7AE-C6EE-42DF-9BBB-159289A2BED5",
              "versionEndExcluding": "13.12.9",
              "versionStartIncluding": "11.4.0"
            },
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1235B1F6-02ED-40C0-BAD8-81D496CF7562",
              "versionEndExcluding": "13.12.9",
              "versionStartIncluding": "11.4.0"
            },
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7BAF03F5-F078-4080-9F72-B51DE3F0EFD8",
              "versionEndExcluding": "14.0.7",
              "versionStartIncluding": "14.0.0"
            },
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "80FE53A3-015A-41EF-B238-DEE9AB2FEF8C",
              "versionEndExcluding": "14.0.7",
              "versionStartIncluding": "14.0.0"
            },
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F02DE4BD-E3C7-491A-9FA7-EB3ED914480F",
              "versionEndExcluding": "14.1.2",
              "versionStartIncluding": "14.1.0"
            },
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "02027E6A-E1D7-4109-BC9A-2B6BC335BA20",
              "versionEndExcluding": "14.1.2",
              "versionStartIncluding": "14.1.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@gitlab.com"
}