CVE-2026-20897

Estado: ModificadaCrítica (9.1)—

Gitea does not properly validate repository ownership when deleting Git LFS locks. A user with write access to one repository may be able to delete LFS locks belonging to other repositories.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Puntuación base: 9.1

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.46%
Percentil entre todas las CVEs puntuadas: 38
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access85 %
Impacto principalT1565.002 Transmitted Data Manipulationimpact75 %
Impacto secundarioT1531 Account Access Removalimpact65 %

AV:N/PR:N sin UI indica explotación remota sin privilegios (T1190). La validación deficiente de propiedad permite manipular LFS locks ajenos (T1565.002: modificación de datos). Afecta integridad de repositorios y potencial denegación de acceso a colaboradores (T1531).

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

Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic Encrypt Sensitive Information

Tecnologías afectadas (1)

Gitea — Gitea

CWE

CWE-284, CWE-639
CWE-639

Referencias

JSON original (NVD)

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  "id": "CVE-2026-20897",
  "cveTags": [],
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              "technicalImpact": "total"
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          "timestamp": "2026-01-23T17:56:55.236953Z"
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  "published": "2026-01-22T22:16:18.960",
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  "vulnStatus": "Modified",
  "weaknesses": [
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    {
      "lang": "en",
      "value": "Gitea does not properly validate repository ownership when deleting Git LFS locks. A user with write access to one repository may be able to delete LFS locks belonging to other repositories."
    },
    {
      "lang": "es",
      "value": "Gitea no valida correctamente la propiedad del repositorio al eliminar bloqueos de Git LFS. Un usuario con acceso de escritura a un repositorio podría eliminar bloqueos LFS pertenecientes a otros repositorios."
    }
  ],
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