CVE-2026-57856 | Cockpit CMS contains a path traversal vulnerability in the B… | CVSS 8.8 HIGH

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

Metadata

CVE ID: CVE-2026-57856
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-25 18:48 UTC
Published: 2026-07-13 22:41 UTC
Last updated: 2026-07-13 22:41 UTC
Primary CWE: CWE-22
Improper Limitation of a Pathname to a Restricted Directory …
Vendor / Product: Cockpit HQ / Cockpit CMS
Sources: cve.org · NVD

Severity & Metrics

8.8 HIGH CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
Cockpit HQ	Cockpit CMS	—	0 < 2.14.0

Weakness (CWE)

CWE	Source	Description
CWE-22	cna	Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.8	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7	HIGH	4.0	cna	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

References (5)