Symfony Vulnerable to stored XSS in WebProfiler CodeExtension::fileExcerpt() — Unescaped Non-PHP File Rendering
Description
Symfony's profiler, a development only debug UI, renders source-code excerpts on several pages using Twig's custom file_excerpt filter. This filter renders PHP files via highlight_string() (which escapes HTML), but renders non-PHP files by splitting on \n and interpolating each line directly into <code>{$line}</code> with no escaping.
An attacker who can write arbitrary bytes into any file under the project root (including e.g. var/log/dev.log), achieves stored XSS against any developer who later opens that file in the profiler.
Resolution
The file_excerpt filter now properly escapes each line of non-PHP files using htmlspecialchars() before concatenating them.
The patch for this issue is available here for branch 6.4.
Credits
Symfony would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | symfony/symfony | >= 6.4.24, < 6.4.40, >= 7.2.9, < 7.4.12, >= 8.0.0, < 8.0.12 | 6.4.40, 7.4.12, 8.0.12 |
| Paquete de Composer | symfony/twig-bridge | >= 6.4.24, < 6.4.40 | 6.4.40 |
| Paquete de Composer | symfony/web-profiler-bundle | >= 7.2.9, < 7.4.12, >= 8.0.0, < 8.0.12 | 7.4.12, 8.0.12 |
Referencias
- https://github.com/symfony/symfony/security/advisories/GHSA-hmr5-2xcr-v8pp
- https://github.com/symfony/symfony/commit/863aa81c61166f1aa74b7732df316f76113acbdb
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45072.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/twig-bridge/CVE-2026-45072.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/web-profiler-bundle/CVE-2026-45072.yaml
- https://github.com/symfony/symfony
- https://symfony.com/cve-2026-45072
- Vector CVSS
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U- Debilidad (CWE)
CWE-79- Plataforma
- Composer
- Paquete
symfony/symfony, symfony/twig-bridge, symfony/web-profiler-bundle- Publicada
- 27.05.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-hmr5-2xcr-v8pp - CC BY 4.0
Historial de vulnerabilidades: symfony/web-profiler-bundle
Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 2
- Primera → última
- 05.2024 05.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 1
- Baja 1
Divulgaciones por año
- 2024: 1
- 2025: 0
- 2026: 1
-
Symfony Vulnerable to stored XSS in WebProfiler CodeExtension::fileExcerpt() — Unescaped Non-PHP File Rendering esta entrada
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