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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

PUBLISHED Reserved 2026-06-25 | Published 2026-07-13 | Updated 2026-07-13 | Assigner VulnCheck




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem types

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Product status

Default status
affected

Any version before 2.14.0
affected

Credits

Saidakbarxon Maxsudxonov finder

References

github.com/cockpit-hq/cockpit (Product) product

github.com/...ommit/dde2d1d74f5f4e11de42a298918ea8c9684f932c (Patch Commit) patch

gist.github.com/sermikr0/821c4edd3c34e98a62a50b07707785bd technical-description

www.vulncheck.com/...uthorization-in-bucket-file-storage-api third-party-advisory

www.vulncheck.com/...-bucket-name-in-bucket-file-storage-api third-party-advisory

cve.org (CVE-2026-57856)

nvd.nist.gov (CVE-2026-57856)

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