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CVE-2026-25133

Estado: AnalizadaMedia (4.8)—

October is a Content Management System (CMS) and web platform. Versions prior to 3.7.14 and 4.1.10 contain a stored cross-site scripting (XSS) vulnerability in the SVG sanitization logic. The regex pattern used to strip event handler attributes (such as onclick or onload) could be bypassed using a crafted payload that exploits how the pattern matches attribute boundaries, allowing malicious SVG files to be uploaded through the Media Manager with embedded JavaScript. Exploitation could lead to privilege escalation if a superuser views or embeds the malicious SVG, and requires authenticated backend access with media upload permissions. The SVG must be viewed or embedded in a page for the payload to trigger. This issue has been fixed in versions 3.7.14 and 4.1.10.

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).

Tecnologías afectadas (1)

Octobercms — October

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-25133",
  "cveTags": [],
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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              "automatable": "no"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-04-16T13:47:21.893252Z"
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N",
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          "version": "4.0",
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
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  "published": "2026-04-14T21:16:25.330",
  "references": [
    {
      "url": "https://github.com/octobercms/october/security/advisories/GHSA-gcqv-f29m-67gr",
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      "description": [
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          "value": "CWE-79"
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  ],
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    {
      "lang": "en",
      "value": "October is a Content Management System (CMS) and web platform. Versions prior to 3.7.14 and 4.1.10 contain a stored cross-site scripting (XSS) vulnerability in the SVG sanitization logic. The regex pattern used to strip event handler attributes (such as onclick or onload) could be bypassed using a crafted payload that exploits how the pattern matches attribute boundaries, allowing malicious SVG files to be uploaded through the Media Manager with embedded JavaScript. Exploitation could lead to privilege escalation if a superuser views or embeds the malicious SVG, and requires authenticated backend access with media upload permissions. The SVG must be viewed or embedded in a page for the payload to trigger. This issue has been fixed in versions 3.7.14 and 4.1.10."
    },
    {
      "lang": "es",
      "value": "October es un Sistema de Gestión de Contenidos (CMS) y plataforma web. Las versiones anteriores a la 3.7.14 y 4.1.10 contienen una vulnerabilidad de cross-site scripting (XSS) almacenada en la lógica de saneamiento de SVG. El patrón de expresiones regulares utilizado para eliminar atributos de gestor de eventos (como onclick o onload) podría ser eludido utilizando una carga útil diseñada que explota cómo el patrón coincide con los límites de los atributos, permitiendo que archivos SVG maliciosos sean cargados a través del Gestor de Medios con JavaScript incrustado. La explotación podría conducir a una escalada de privilegios si un superusuario visualiza o incrusta el SVG malicioso, y requiere acceso autenticado al backend con permisos de carga de medios. El SVG debe ser visualizado o incrustado en una página para que la carga útil se active. Este problema ha sido solucionado en las versiones 3.7.14 y 4.1.10."
    }
  ],
  "lastModified": "2026-07-25T11:10:00.100",
  "configurations": [
    {
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