# CVE-2026-126662: Contao access control bypass in file manager Edit-Multiple

Source: https://junglewise.ai/threats/cve-2026-126662-contao-4-0-0-before-5-3-54-5-4-0-before-5-7-17-and-6-0-0-before  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-11. Updated: 2026-11-11  
License: CC BY 4.0 with a link back

CVE-2026-126662 · Severity: high · CVSS 7.1 · Published 2026-11-11

Contao is a web content management system used to build and manage websites. A vulnerability in the file manager allows backend users with restricted file access to edit folders outside their assigned boundaries through a multi-edit operation, potentially exposing protected files for public download or excluding them from security backups.

Technologies: [Contao](https://junglewise.ai/threats/technologies/contao). Vendors: [Contao](https://junglewise.ai/threats/vendors/contao).

## Quick answers

**Is CVE-2026-126662 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-126662 being exploited in the wild.

**How severe is CVE-2026-126662?** High severity, with a CVSS score of 7.1, published 11 November 2026.

**Which products and versions are affected?** Contao 4.0.0 before 5.3.54, 5.4.0 before 5.7.17, 6.0.0 before 6.0.6.

**Is there a fix for CVE-2026-126662?** Yes: fixed in 5.3.54, 5.7.17, 6.0.6. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-126662 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-126662?** Check whether you run Contao at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 5.3.54, 5.7.17, 6.0.6

## Technical details

An access control bypass in the DC_Folder.php driver's editAll() method fails to validate whether folders passed in the IDS parameter are within a user's filemount restrictions. Authenticated backend users with protected or syncExclude field permissions can submit out-of-bounds folder paths to modify protected folder status or DBAFS sync exclusions, bypassing filemount access controls.

## Affected products

- Contao Contao 4.0.0 before 5.3.54, 5.4.0 before 5.7.17, 6.0.0 before 6.0.6

## Timeline

- 2026-11-11: disclosed

## References

- [https://github.com/contao/contao/blob/5.3.53/core-bundle/contao/drivers/DC_Folder.php](https://github.com/contao/contao/blob/5.3.53/core-bundle/contao/drivers/DC_Folder.php)
- [https://github.com/contao/contao/commit/240e169441796bb703819ee0e22728708f946b70](https://github.com/contao/contao/commit/240e169441796bb703819ee0e22728708f946b70)

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