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CVE-2026-20736

Estado: ModificadaAlta (7.5)—

Gitea does not properly verify repository context when deleting attachments. A user who previously uploaded an attachment to a repository may be able to delete it after losing access to that repository by making the request through a different repository they can access.

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).

🎯 Técnicas ATT&CK

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

Vulnerabilidad de control de acceso (CWE-284) en aplicación web expuesta accesible sin privilegios ni interacción (AV:N/PR:N/UI:N). Impacto: manipulación de datos ajenos (borrado de adjuntos) y potencial impacto en disponibilidad/integridad de contenido compartido.

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 ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficEncrypt Sensitive Information

Tecnologías afectadas (1)

Gitea — Gitea

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-20736",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-20736",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-23T21:13:08.431490Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Secondary",
        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
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  },
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      "affectedData": [
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          "product": "Gitea Open Source Git Server",
          "versions": [
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              "version": "0",
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    {
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      "affectedData": [
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          "product": "OpenShift Pipelines",
          "packageName": "openshift-pipelines/pipelines-opc-rhel9",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "unaffected"
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          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-01-22T22:16:17.207",
  "references": [
    {
      "url": "https://blog.gitea.com/release-of-1.25.4/",
      "tags": [
        "Release Notes"
      ],
      "source": "88ee5874-cf24-4952-aea0-31affedb7ff2"
    },
    {
      "url": "https://github.com/go-gitea/gitea/pull/36320",
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        "Patch"
      ],
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    },
    {
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      "tags": [
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
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  "descriptions": [
    {
      "lang": "en",
      "value": "Gitea does not properly verify repository context when deleting attachments. A user who previously uploaded an attachment to a repository may be able to delete it after losing access to that repository by making the request through a different repository they can access."
    },
    {
      "lang": "es",
      "value": "Gitea no verifica correctamente el contexto del repositorio al eliminar adjuntos. Un usuario que previamente subió un adjunto a un repositorio podría eliminarlo después de perder el acceso a ese repositorio al realizar la solicitud a través de un repositorio diferente al que puede acceder."
    }
  ],
  "lastModified": "2026-07-15T02:18:23.973",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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}