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CVE-2026-58657

CVE-2026-58657 · Grav - Stored CSS Injection via Markdown Image resize() Action

Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.

Grav before 2.0.0 (affected through 2.0.0-rc.9 and the 2.0 branch) contains a stored CSS injection vulnerability in the Markdown image resize() media action. Prior media hardening rejects direct ?style= payloads and unsafe attribute() fallbacks, but the resize() action in Excerpts::processMediaActions() writes caller-controlled values directly into the image's styleAttributes. A lower-privileged content editor who can edit page Markdown can store a crafted image URL with semicolon-delimited CSS declarations in the resize parameters, which are rendered into the final <img style=...> attribute when a higher-privileged reviewer/admin views the page or preview. This does not require JavaScript execution but enables UI redress/overlay and content-manipulation attacks (e.g., a full-viewport fixed overlay). Fixed in 2.0.0.

CVSS 4.8 · Media · EPSS 0,3% · Corrección disponible

Publicación
Actualización

Pila tecnológica: php

Productos y versiones afectados

  • grav

    Versiones
    • ≥ 2.0.0-rc.9, < 2.0.0: Afectada (semver)
    • 2.0.0: No afectada (semver)

    Actualiza a 2.0.0

  • getgrav/grav Packagist

    Versiones
    • 2.0.0-rc.10
    • 2.0.0-rc.9
    Intervalos de versiones afectados
    • ECOSYSTEM: ≥ 2.0.0-rc.9, < 2.0.0

    Actualiza a 2.0.0

Fuentes originales

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