Path traversal in Contao - #VU134537
Published: June 15, 2026
Vulnerability identifier: #VU134537
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Contao
Affected software:
Contao
Contao
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to path traversal in JobsController::downloadJobAttachment() and attachment lookup logic when handling a crafted attachment identifier in the job attachment download endpoint. A remote user can supply an attachment identifier containing traversal sequences to disclose sensitive information.
This is a cross-job authorization bypass limited to files within the var/job-attachments storage, and exploitation requires knowledge of the target job UUID and attachment filename.
Remediation
Install security update from vendor's website.