CVE-2026-126663
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 a path traversal vulnerability that allows content editors to read image files anywhere on the filesystem via the {{image::}} insert tag. Attackers can embed percent-encoded sequences like ..%2f that pass Validator::isInsecurePath() before rawurldecode(), making the frontend resize and serve readable image files outside the files directory.
Affected Packages
https://github.com/contao/contao.git (GITHUB):
Affected version(s) >=6.0.0-RC1 <6.0.6Fix Suggestion:
Update to version 6.0.6https://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) >=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) >=5.4.0-RC1 <5.7.17Fix Suggestion:
Update to version 5.7.17contao/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) >=5.4.0-RC1 <5.7.17Fix Suggestion:
Update to version 5.7.17contao/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:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Incorrect Behavior Order: Validate Before Canonicalize
EPSS
Base Score:
0.36