Description
Contao 4.0.0 before 5.3.54, 5.4.0 before 5.7.17, and 6.0.0 before 6.0.6 contains an access control bypass vulnerability that allows filemount-restricted backend users to modify folders outside their filemount via the file manager Edit-Multiple operation. Attackers holding the protected or syncExclude field permission can submit outside folder paths in the IDS parameter to publish protected folders or exclude them from DBAFS synchronization, exposing files for public download.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Contao | Contao | 4.0.0 – < 5.3.54, 5.4.0-RC1 – < 5.7.17, 6.0.0-RC1 – < 6.0.6 | 5.3.54 |
Advisories 1
- WID-SEC-2026-4516 Contao: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
References
- GitHub Security Advisory (GHSA-9jfh-v443-w3fj) vendor-advisory
- https://github.com/contao/contao/commit/c01898f99c5d5af50a227ee85f27270c5427f900 patch
- https://github.com/contao/contao/commit/a104202df2b532bb64805a0856fc94bb0bddbb66 patch
- https://github.com/contao/contao/commit/240e169441796bb703819ee0e22728708f946b70 patch
- Contao 5.3.54 Release Notes release-notes
- Contao 5.7.17 Release Notes release-notes
- Contao 6.0.6 Release Notes release-notes
- https://github.com/contao/contao/blob/5.3.53/core-bundle/contao/drivers/DC_Folder.php#L1716-L1720 technical-description
- VulnCheck Advisory: Contao 4.0.0 before 5.3.54, 5.4.0 before 5.7.17, and 6.0.0 before 6.0.6 Filemount Bypass via Edit-Multiple third-party-advisory