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…
CVE-2026-126662
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.
Assessment
- CVSS
- 7.1 (v4.0)
- Severity
- High
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 11 November 2026
- Last updated
- 12 November 2026
- Assigner
- VulnCheck
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
At the source
References
- https://github.com/contao/contao/security/advisories/GHSA-9jfh-v443-w3fj
- https://github.com/contao/contao/commit/c01898f99c5d5af50a227ee85f27270c5427f900
- https://github.com/contao/contao/commit/a104202df2b532bb64805a0856fc94bb0bddbb66
- https://github.com/contao/contao/commit/240e169441796bb703819ee0e22728708f946b70
- https://github.com/contao/contao/releases/tag/5.3.54
- https://github.com/contao/contao/releases/tag/5.7.17
- https://github.com/contao/contao/releases/tag/6.0.6
- https://github.com/contao/contao/blob/5.3.53/core-bundle/contao/drivers/DC_Folder.php#L1716-L1720
- https://www.vulncheck.com/advisories/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
Community proofs of concept
No community proof of concept yet. If you have one for a published vulnerability and the right to share it, add it below — it will appear here once reviewed.
Submit a proof of concept
Only for publicly disclosed vulnerabilities, and only material from testing you were authorised to perform. This platform does not buy, sell, or broker exploits — see earning from vulnerability research for legitimate bounty programs. Submissions are reviewed before they appear. Text only; do not include live credentials, personal data, or anything targeting systems you are not permitted to test.
Query this programmatically
Agents can read this through the MCP endpoint, or over HTTP:
curl https://cve.zerocrew.in/api/cve/CVE-2026-126662