CVE-2026-126662
Published:November 11, 2026
Updated:November 12, 2026
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 Packages
https://github.com/contao/contao.git (GITHUB):
Affected version(s) >=5.4.0-RC1 <5.7.17Fix Suggestion:
Update to version 5.7.17https://github.com/contao/contao.git (GITHUB):
Affected version(s) >=4.0.0-beta1 <5.3.54 || >=5.0.0-RC1 <5.3.54Fix Suggestion:
Update to version 5.3.54https://github.com/contao/contao.git (GITHUB):
Affected version(s) >=6.0.0-RC1 <6.0.6Fix Suggestion:
Update to version 6.0.6contao/core-bundle (PHP):
Affected version(s) >=5.4.0-RC1 <5.7.17Fix Suggestion:
Update to version 5.7.17contao/contao (PHP):
Affected version(s) >=5.4.0-RC1 <5.7.17Fix Suggestion:
Update to version 5.7.17contao/contao (PHP):
Affected version(s) >=4.4.22 <5.3.54 || >=5.0.0-RC1 <5.3.54Fix Suggestion:
Update to version 5.3.54contao/contao (PHP):
Affected version(s) >=6.0.0-RC1 <6.0.6Fix Suggestion:
Update to version 6.0.6contao/core-bundle (PHP):
Affected version(s) >=4.0.0-beta1 <5.3.54 || >=5.0.0-RC1 <5.3.54Fix Suggestion:
Update to version 5.3.54contao/core-bundle (PHP):
Affected version(s) >=6.0.0-RC1 <6.0.6Fix Suggestion:
Update to version 6.0.6Related Resources (12)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Missing Authorization
EPSS
Base Score:
0.36