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Cockpit CMS CVE-2026-57855

HIGH
Improper Access Control (CWE-284)
2026-07-13 VulnCheck
PHP Authentication Bypass 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-reachable API with no authorization check, exploitable by any authenticated low-privilege user (PR:L) without interaction; full read/write/delete over bucket files gives high C/I/A, scope unchanged.

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 - 22:33 cve.org
HIGH 8.7

DescriptionCVE.org

Cockpit CMS contains a missing authorization vulnerability in the Bucket file storage API (/system/buckets/api). The api() method in modules/System/Controller/Buckets.php executes bucket commands (ls, upload, removefiles, rename, createfolder) without performing any ACL or role check. Any authenticated user, regardless of role, can perform all bucket operations on any named bucket, including buckets intended for admin use only.

AnalysisAI

Broken access control in Cockpit CMS's Bucket file storage API (/system/buckets/api) lets any authenticated user, regardless of assigned role, execute all bucket file operations (list, upload, delete, rename, create folder) against any named bucket - including admin-only buckets. VulnCheck reported the flaw and publicly available exploit code exists (proof-of-concept gist), but there is no evidence of active exploitation. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate as low-privilege user
Delivery
Send crafted request to /system/buckets/api
Exploit
Invoke bucket command without ACL check
Execution
Read, upload, or delete admin bucket files
Impact
Exfiltrate or tamper with stored assets
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid authenticated Cockpit CMS session of any role (PR:L) and network reachability to the /system/buckets/api endpoint; no administrative role, no user interaction, and no special server configuration are needed because the api() method in Buckets.php enforces no ACL at all. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H) describes a network-reachable, low-complexity flaw requiring only low privileges (any authenticated account) and no user interaction, with high impact to confidentiality, integrity, and availability of bucket-stored files - consistent with the described missing-authorization behavior. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker obtains any low-privilege Cockpit account - for example a self-registered or editor-level user - and sends an authenticated request to /system/buckets/api targeting an admin-only bucket. Because the api() method performs no role check, they can list and download sensitive files, upload a malicious payload, or delete/rename existing assets. …
Remediation Vendor-released patch: upgrade to Cockpit CMS 2.14.0, which adds the missing authorization enforcement to the Bucket file storage API; apply it per the fix commit dde2d1d74f5f4e11de42a298918ea8c9684f932c and the VulnCheck advisory at https://www.vulncheck.com/advisories/cockpit-cms-missing-authorization-in-bucket-file-storage-api. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all Cockpit CMS instances in your environment and document current versions; assess whether any instances handle sensitive or regulated data that could be impacted by unauthorized file access. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-57855 vulnerability details – vuln.today
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