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CVE-2026-25728

Estado: AnalizadaCrítica (9.3)—

ClipBucket v5 is an open source video sharing platform. Prior to 5.5.3 - #40, a Time-of-Check to Time-of-Use (TOCTOU) race condition vulnerability exists in ClipBucket's avatar and background image upload functionality. The application moves uploaded files to a web-accessible location before validating them, creating a window where an attacker can execute arbitrary PHP code before the file is deleted. The uploaded file was moved to a web-accessible path via move_uploaded_file(), then validated via ValidateImage(). If validation failed, the file was deleted via @unlink(). This vulnerability is fixed in 5.5.3 - #40.

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.

TOCTOU en carga de archivos PHP en ruta web accesible (AV:N, PR:N, UI:N) permite ejecución remota de código antes de validación. Confianza alta por descripción explícita del flujo de explotación.

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 ManagementNetwork SegmentationVulnerability ScanningRestrict Web-Based ContentRestrict File and Directory PermissionsRemote Data Storage

Tecnologías afectadas (1)

Oxygenz — Clipbucket

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-25728",
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          "id": "CVE-2026-25728",
          "role": "CISA Coordinator",
          "options": [
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            },
            {
              "technicalImpact": "total"
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          "version": "2.0.3",
          "timestamp": "2026-02-11T15:30:23.992657Z"
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          "exploitMaturity": "NOT_DEFINED",
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            }
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  "published": "2026-02-10T18:16:38.053",
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      "url": "https://github.com/MacWarrior/clipbucket-v5/commit/09536e6e2ca6d69a2ee83190b588c0b8116dd16d",
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    {
      "url": "https://github.com/MacWarrior/clipbucket-v5/security/advisories/GHSA-xq7c-m5r2-9wqj",
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      "lang": "en",
      "value": "ClipBucket v5 is an open source video sharing platform. Prior to 5.5.3 - #40, a Time-of-Check to Time-of-Use (TOCTOU) race condition vulnerability exists in ClipBucket's avatar and background image upload functionality. The application moves uploaded files to a web-accessible location before validating them, creating a window where an attacker can execute arbitrary PHP code before the file is deleted. The uploaded file was moved to a web-accessible path via move_uploaded_file(), then validated via ValidateImage(). If validation failed, the file was deleted via @unlink(). This vulnerability is fixed in 5.5.3 - #40."
    },
    {
      "lang": "es",
      "value": "ClipBucket v5 es una plataforma de código abierto para compartir videos. Antes de la versión 5.5.3 - #40, existe una vulnerabilidad de condición de carrera de Tiempo de Verificación a Tiempo de Uso (TOCTOU) en la funcionalidad de carga de avatares e imágenes de fondo de ClipBucket. La aplicación mueve los archivos cargados a una ubicación accesible desde la web antes de validarlos, creando una ventana donde un atacante puede ejecutar código PHP arbitrario antes de que el archivo sea eliminado. El archivo cargado fue movido a una ruta accesible desde la web a través de move_uploaded_file(), luego validado a través de ValidateImage(). Si la validación fallaba, el archivo era eliminado a través de @unlink(). Esta vulnerabilidad está corregida en 5.5.3 - #40."
    }
  ],
  "lastModified": "2026-06-17T10:25:07.250",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:oxygenz:clipbucket:*:*:*:*:*:*:*:*",
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}