Contao: Possible path traversal in job download URIs
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| contao | contao | 5.7.0 to before 5.7.7 | 5.7.7 | Patch available | CNA |
| — | contao/contao (Packagist) | 5.7.0 to before 5.7.7 | 5.7.7 | Patch available | GHSA-grm4-wm43-9jh5 |
| — | contao/core-bundle (Packagist) | 5.7.0 to before 5.7.7 | 5.7.7 | Patch available | GHSA-grm4-wm43-9jh5 |
- contao Vendorcontao Affected 5.7.0 to before 5.7.7 Fixed in 5.7.7 Patch available CNA
- contao/contao (Packagist) Vendor— Affected 5.7.0 to before 5.7.7 Fixed in 5.7.7 Patch available GHSA-grm4-wm43-9jh5
- contao/core-bundle (Packagist) Vendor— Affected 5.7.0 to before 5.7.7 Fixed in 5.7.7 Patch available GHSA-grm4-wm43-9jh5
Remediation
- Fix · CNA contao (contao) Fixed in 5.7.7
- Fix · GHSA-grm4-wm43-9jh5 contao/contao (Packagist) Fixed in 5.7.7 Advisory →
- Fix · GHSA-grm4-wm43-9jh5 contao/core-bundle (Packagist) Fixed in 5.7.7 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-55825
- 2026-10-03 Alias added: GHSA-grm4-wm43-9jh5
References
Other 5
- https://github.com/contao/contao/security/advisories/GHSA-grm4-wm43-9jh5
- https://contao.org/en/security-advisories/path-traversal-in-the-jobs-module
- https://github.com/FriendsOfPHP/security-advisories/blob/master/contao/contao/CVE-2026-55825.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/contao/core-bundle/CVE-2026-55825.yaml
- https://github.com/contao/contao
More contao vulnerabilities
- TI-2022-09661 Contao Managed Edition v1.5.0 was discovered to contain a remote command execution (RCE)… CVSS 3.1CRITICAL 9.8
- TI-2024-30849 Unrestricted file upload in Contao CVSS 3.1MEDIUM 6.4
- TI-2023-18600 Contao cross site scripting vulnerability via input unit widget CVSS 3.1MEDIUM 6.5
- TI-2014-01453 Contao CMS through 3.2.4 has PHP Object Injection Vulnerabilities CVSS 3.1CRITICAL 9.8
- TI-2022-08709 Cross site scripting via canonical tag CVSS 3.1HIGH 7.2
- TI-2019-08602 Contao 4.x allows SQL Injection. CVSS 3.0CRITICAL 9.8
Sources
- CVE-2026-55825 · CVE Program
- CVE-2026-55825 · NVD
- FIRST EPSS
- GHSA-grm4-wm43-9jh5 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences