CVE-2026-20912

Estado: ModificadaCrítica (9.1)—

Gitea does not properly validate repository ownership when linking attachments to releases. An attachment uploaded to a private repository could potentially be linked to a release in a different public repository, making it accessible to unauthorized users.

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 principalT1005 Data from Local Systemcollection75 %
Impacto secundarioT1565.002 Transmitted Data Manipulationimpact60 %

AV:N/PR:N/UI:N indica explotación remota sin privilegios (T1190). Permite acceder a archivos privados (T1005) y manipular su visibilidad enlazándolos en repositorios públicos (T1565.002).

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-283

Referencias

JSON original (NVD)

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  "id": "CVE-2026-20912",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
            },
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              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-23T17:51:12.073308Z"
        }
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  ],
  "published": "2026-01-22T22:16:19.297",
  "references": [
    {
      "url": "https://blog.gitea.com/release-of-1.25.4/",
      "tags": [
        "Release Notes"
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      "source": "88ee5874-cf24-4952-aea0-31affedb7ff2"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
      "description": [
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          "value": "CWE-284"
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          "value": "CWE-639"
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    {
      "lang": "en",
      "value": "Gitea does not properly validate repository ownership when linking attachments to releases. An attachment uploaded to a private repository could potentially be linked to a release in a different public repository, making it accessible to unauthorized users."
    },
    {
      "lang": "es",
      "value": "Gitea no valida correctamente la propiedad del repositorio al vincular adjuntos a las versiones. Un adjunto subido a un repositorio privado podría vincularse potencialmente a una versión en un repositorio público diferente, haciéndolo accesible a usuarios no autorizados."
    }
  ],
  "lastModified": "2026-07-15T02:18:24.963",
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}