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CVE-2026-103620

Estado: Pendiente de análisisMedia (6)—

A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed a repository collaborator with write access to delete the current default branch through the GraphQL API and cause an attacker-controlled branch to become the new default. In repositories that required pull-request review but did not restrict branch deletion, this bypassed the review requirement and caused fresh clones and default-branch API requests to use attacker-controlled content. This vulnerability affected supported GitHub Enterprise Server releases in the 3.18, 3.19, 3.20, 3.21, and 3.22 series and was fixed in versions 3.18.16, 3.19.13, 3.20.9, 3.21.7, and 3.22.2. This vulnerability was reported via the GitHub Bug Bounty program.

CVSS

Probabilidad de explotación (EPSS)

FIRST aún no ha puntuado esta CVE (habitual en CVEs muy recientes o rechazadas).

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de autorización en API GraphQL remota (PR:L) que permite manipular ramas de repositorio. El atacante sustituye la rama principal por contenido controlado, eludiendo revisiones de PR.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementActive Directory ConfigurationVulnerability ScanningUser TrainingUser Account ManagementThreat Intelligence Program

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Github — Enterprise ServerAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-103620",
  "cveTags": [],
  "metrics": {
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "product-cna@github.com",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 6,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/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",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "LOW",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "product-cna@github.com",
      "affectedData": [
        {
          "vendor": "GitHub",
          "product": "Enterprise Server",
          "versions": [
            {
              "status": "affected",
              "changes": [
                {
                  "at": "3.18.16",
                  "status": "unaffected"
                }
              ],
              "version": "3.18.0",
              "lessThan": "3.18.*",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "changes": [
                {
                  "at": "3.19.13",
                  "status": "unaffected"
                }
              ],
              "version": "3.19.0",
              "lessThan": "3.19.*",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "changes": [
                {
                  "at": "3.20.9",
                  "status": "unaffected"
                }
              ],
              "version": "3.20.0",
              "lessThan": "3.20.*",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "changes": [
                {
                  "at": "3.21.7",
                  "status": "unaffected"
                }
              ],
              "version": "3.21.0",
              "lessThan": "3.21.*",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "changes": [
                {
                  "at": "3.22.2",
                  "status": "unaffected"
                }
              ],
              "version": "3.22.0",
              "lessThan": "3.22.*",
              "versionType": "semver"
            }
          ],
          "defaultStatus": "unknown"
        }
      ]
    }
  ],
  "published": "2026-10-06T19:17:39.700",
  "references": [
    {
      "url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.16",
      "source": "product-cna@github.com"
    },
    {
      "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.13",
      "source": "product-cna@github.com"
    },
    {
      "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.9",
      "source": "product-cna@github.com"
    },
    {
      "url": "https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.7",
      "source": "product-cna@github.com"
    },
    {
      "url": "https://docs.github.com/en/enterprise-server@3.22/admin/release-notes#3.22.2",
      "source": "product-cna@github.com"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "product-cna@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed a repository collaborator with write access to delete the current default branch through the GraphQL API and cause an attacker-controlled branch to become the new default. In repositories that required pull-request review but did not restrict branch deletion, this bypassed the review requirement and caused fresh clones and default-branch API requests to use attacker-controlled content. This vulnerability affected supported GitHub Enterprise Server releases in the 3.18, 3.19, 3.20, 3.21, and 3.22 series and was fixed in versions 3.18.16, 3.19.13, 3.20.9, 3.21.7, and 3.22.2. This vulnerability was reported via the GitHub Bug Bounty program."
    }
  ],
  "lastModified": "2026-10-06T20:03:40.690",
  "sourceIdentifier": "product-cna@github.com"
}