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Cockpit CMS CVE-2026-57856

HIGH
Path Traversal (CWE-22)
2026-07-13 VulnCheck
PHP Path Traversal Cockpit Cms
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.8 HIGH

Network API reachable with low-complexity '../' payload; requires an authenticated low-privileged account (PR:L); traversal enables cross-bucket read, write, and delete so C/I/A all High; scope unchanged within the app's own storage.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Jul 13, 2026 - 23:15 vuln.today
Analysis Generated
Jul 13, 2026 - 23:15 vuln.today
CVE Published
Jul 13, 2026 - 22:41 cve.org
HIGH 8.7

DescriptionCVE.org

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

AnalysisAI

Path-traversal privilege escalation in Cockpit CMS Bucket file storage API (before 2.14.0) lets an authenticated low-privileged user bypass per-bucket isolation by supplying a '../' bucket name, granting cross-bucket read, upload, and delete over all files regardless of owner or role. The flaw stems from an incomplete sanitization regex that strips dangerous characters but preserves dot sequences, which Flysystem then normalizes down to the storage root. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate as low-privileged user
Delivery
Craft request to /system/buckets/api with '../' bucket name
Exploit
Bypass sanitizer, resolve path to uploads root
Execution
List, upload, and delete cross-bucket files
Impact
Compromise data of other users and roles
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Vulnerability AssessmentAI

Exploitation Requires a valid authenticated Cockpit CMS account with at least low privileges granting access to the Bucket file storage API endpoint (/system/buckets/api) - consistent with PR:L in the CVSS vector; unauthenticated exploitation is not indicated. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-assigned CVSS 4.0 score is 8.7 (High) with vector AV:N/AC:L/AT:N/PR:L/UI:N and high vulnerable-system confidentiality, integrity, and availability impact - meaning network-reachable, low-complexity, no user interaction, but requiring an authenticated low-privileged account (PR:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A low-privileged authenticated user (for example, an editor limited to their own bucket in a multi-tenant Cockpit deployment) sends a crafted request to /system/buckets/api with a bucket name like '../' or 'buckets/..'. The sanitizer leaves the traversal intact, Flysystem resolves the path to the uploads root, and the attacker lists, downloads, overwrites, or deletes files belonging to every other bucket and role. …
Remediation Vendor-released patch: upgrade to Cockpit CMS 2.14.0 or later (fix commit dde2d1d74f5f4e11de42a298918ea8c9684f932c, released 2026-03-30). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify and document all Cockpit CMS deployments and their current versions. …

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CVE-2026-57856 vulnerability details – vuln.today
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