CVE-2026-55825 — contao / contao
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')Contao is an Open Source CMS. In versions 5.7.0 through 5.7.6, an authenticated backend user who can access one job can request an attachment identifier containing ../ segments and make the job attachment download endpoint read a file from another job directory inside var/job-attachments. The controller authorizes only the jobUuid route parameter. The later attachment lookup joins that authorized job UUID with the attacker-controlled identifier, then passes the combined path to the virtual filesystem. VirtualFilesystem::resolve() canonicalizes the whole path and only rejects paths that escape the filesystem mount, so authorized-job/../victim-job/debug_log.csv becomes victim-job/debug_log.csv. This is a cross-job authorization bypass for known job attachment paths. It is not a practical brute-force against unknown jobs because job directories are UUID v4 values.
| Software | From | Fixed in |
|---|---|---|
contao / contao
|
5.7.0 | 5.7.7 |
|
contao / core-bundle
|
5.7.0 | 5.7.7 |
- https://contao.org/en/security-advisories/path-traversal-in-the-jobs-module
- https://github.com/contao/contao/security/advisories/GHSA-grm4-wm43-9jh5
- https://github.com/FriendsOfPHP/security-advisories/blob/master/contao/contao/CVE-2026-55825.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/contao/core-bundle/CVE-2026-55825.yaml
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