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CVE-2020-26409

Estado: ModificadaMedia (6.5)—

Se presenta una vulnerabilidad de DOS en Gitlab CE/EE versiones posteriores a 10.3 incluyéndola, versiones anteriores a 13.4.7, versiones posteriores a 13.5 incluyéndola, versiones anteriores a 13.5.5, versiones posteriores a 13.6 incluyéndola, versiones anteriores 13.6.2, que permite a un atacante activar un recurso no controlado al omitir la comprobación de entrada en los campos markdown

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-2020-26409",
  "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:N/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "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:N/A:L",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 2.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "cve@gitlab.com",
      "affectedData": [
        {
          "vendor": "GitLab",
          "product": "GitLab CE/EE",
          "versions": [
            {
              "status": "affected",
              "version": ">=10.3"
            },
            {
              "status": "affected",
              "version": "<13.4.7"
            },
            {
              "status": "affected",
              "version": ">=13.5"
            },
            {
              "status": "affected",
              "version": "<13.5.5"
            },
            {
              "status": "affected",
              "version": ">=13.6"
            },
            {
              "status": "affected",
              "version": "<13.6.2"
            }
          ]
        }
      ]
    }
  ],
  "published": "2020-12-11T02:15:11.490",
  "references": [
    {
      "url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26409.json",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@gitlab.com"
    },
    {
      "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/259626",
      "tags": [
        "Broken Link"
      ],
      "source": "cve@gitlab.com"
    },
    {
      "url": "https://hackerone.com/reports/990461",
      "tags": [
        "Permissions Required"
      ],
      "source": "cve@gitlab.com"
    },
    {
      "url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26409.json",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/259626",
      "tags": [
        "Broken Link"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://hackerone.com/reports/990461",
      "tags": [
        "Permissions Required"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        },
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A DOS vulnerability exists in Gitlab CE/EE >=10.3, <13.4.7,>=13.5, <13.5.5,>=13.6, <13.6.2 that allows an attacker to trigger uncontrolled resource by bypassing input validation in markdown fields."
    },
    {
      "lang": "es",
      "value": "Se presenta una vulnerabilidad de DOS en Gitlab CE/EE versiones posteriores a 10.3 incluyéndola, versiones anteriores a 13.4.7, versiones posteriores a 13.5 incluyéndola, versiones anteriores a 13.5.5,  versiones posteriores a 13.6 incluyéndola, versiones anteriores 13.6.2, que permite a un atacante activar un recurso no controlado al omitir la comprobación de entrada en los campos markdown"
    }
  ],
  "lastModified": "2026-06-17T03:08:05.143",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BD344029-BC42-4233-AA0F-37DC87F8AB1F",
              "versionEndExcluding": "13.4.7",
              "versionStartIncluding": "10.3.0"
            },
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "512D9B32-3BDA-49DD-BB42-EAD4270B5FDD",
              "versionEndExcluding": "13.4.7",
              "versionStartIncluding": "10.3.0"
            },
            {
              "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
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              "matchCriteriaId": "468AFC4C-4AFE-4502-AE04-CEC567CC9454",
              "versionEndExcluding": "13.5.5",
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              "versionEndExcluding": "13.6.2",
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          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "cve@gitlab.com"
}