CVE-2026-57856
Cockpit CMS Path Traversal via Bucket Name in Bucket File Storage API
- State
- Published
- Severity
- 8.7 High
- Published
- Jul 13, 2026
- Updated
- Jul 14, 2026
- Reserved
- Jun 25, 2026
Description
Cockpit CMS contains a path traversal vulnerability in the Bucket file storage API (/system/buckets/api). The api() method in modules/System/Controller/Buckets.php sanitizes the bucket name with preg_replace('/[^a-zA-Z0-9-_\\.]/','', $bucket), which permits '..' and '../' sequences. The sanitized value is interpolated into a Flysystem path as uploads://buckets/{bucket}. Flysystem's WhitespacePathNormalizer resolves 'buckets/..' to the empty string (the uploads storage root) without raising PathTraversalDetected because the '..' has a preceding component to consume. An authenticated low-privileged user can send a crafted request with a '../' bucket name to list, upload, and delete files across all buckets, including those belonging to other users or roles
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Products
| Product | Versions |
|---|---|
Cockpit CMSCockpit HQ |
|
References
- Productproduct
- Patch Commitpatch
- https://gist.github.com/sermikr0/821c4edd3c34e98a62a50b07707785bdtechnical-description
- https://www.vulncheck.com/advisories/cockpit-cms-missing-authorization-in-bucket-file-storage-apithird-party-advisory
- https://www.vulncheck.com/advisories/cockpit-cms-path-traversal-via-bucket-name-in-bucket-file-storage-apithird-party-advisory
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