Cockpit HQ Cockpit CMS up to 2.13.x Bucket file storage API Buckets.php api bucket path traversal

Summaryinfo

A vulnerability classified as critical has been found in Cockpit HQ Cockpit CMS up to 2.13.x. The impacted element is the function api of the file modules/System/Controller/Buckets.php of the component Bucket file storage API. The manipulation of the argument bucket leads to path traversal. This vulnerability is traded as CVE-2026-57856. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Cockpit HQ Cockpit CMS up to 2.13.x. This issue affects the function api of the file modules/System/Controller/Buckets.php of the component Bucket file storage API. The manipulation of the argument bucket with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-57856 since 06/25/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

By approaching the search of inurl:modules/System/Controller/Buckets.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.14.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Content Management System

Vendor

• Cockpit HQ

Name

• Cockpit CMS

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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CVSSv3info

CVSSv2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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