CVE-2026-55825 Details
Description
Contao is an Open Source CMS. In versions 5.7.0 through 5.7.6, an authenticated backend user who can access one job can request an attachment identifier containing ../ segments and make the job attachment download endpoint read a file from another job directory inside var/job-attachments. The controller authorizes only the jobUuid route parameter. The later attachment lookup joins that authorized job UUID with the attacker-controlled identifier, then passes the combined path to the virtual filesystem. VirtualFilesystem::resolve() canonicalizes the whole path and only rejects paths that escape the filesystem mount, so authorized-job/../victim-job/debug_log.csv becomes victim-job/debug_log.csv. This is a cross-job authorization bypass for known job attachment paths. It is not a practical brute-force against unknown jobs because job directories are UUID v4 values.
A path traversal vulnerability has been identified in Contao versions 5.7.0 through 5.7.6. This issue allows an authenticated backend user with access to a job to exploit the job attachment download endpoint. By crafting an attachment identifier that includes '../' segments, the user can manipulate the endpoint to read files from other job directories within 'var/job-attachments'. The vulnerability arises because the controller only verifies the 'jobUuid' route parameter, allowing unauthorized access to files by combining it with an attacker-controlled identifier. The virtual filesystem resolution process fails to enforce proper boundaries, enabling access to sensitive log files from different jobs.
Users can upgrade to Contao version 5.7.7, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 31, 2026CISA-ADP
Assessed Jul 31, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/contao/contao/security/advisories/GHSA-grm4-wm43-9jh5 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Contao | >= 5.7.0, <= 5.7.6 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 1, 2026 | CVE Modified | CISA-ADP |
| Jul 31, 2026 | New CVE Received | [email protected] |