Path Traversal in Cockpit Hq Cms
CVE-2026-57856
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
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Cockpit Hq Cms — versions 0
Weakness classification (CWE)
References
- github.com/cockpit-hq/cockpit (product)
- github.com/Cockpit-HQ/Cockpit/commit/dde2d1d74f5f4e11de42a298918ea8c9684f932c (patch)
- gist.github.com/sermikr0/821c4edd3c34e98a62a50b07707785bd (technical-description)
- www.vulncheck.com/advisories/cockpit-cms-missing-authorization-in-bucket-file-s… (third-party-advisory)
- www.vulncheck.com/advisories/cockpit-cms-path-traversal-via-bucket-name-in-buck… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-57856?
- CVE-2026-57856 is a high-severity vulnerability in Cockpit Hq Cms, classified under Path Traversal. CVSS score: 8.8/10. Published 2026-07-13.
- How severe is CVE-2026-57856?
- High severity. CVSS v3 base score is 8.8 out of 10.