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CVE-2026-38991 — Vulnerability in cockpit-hq/cockpit — CVE Details

HIGH

Cockpit Vulnerable to Unrestricted Upload of File with Dangerous Type

Published April 29, 2026Updated May 6, 2026Source: osv

Summary

Cockpit versions 2.13.5 and earlier are affected by a misconfiguration within the Bucket component _isFileTypeAllowed function where a specially crafted filename bypasses an extension filter. This allows an authenticated attacker to rename arbitrary files with the .php file extension enabling arbitrary code to be executed on the underlying server.

Advisory Timeline

  • First published April 29, 2026 (166 days ago).
  • Last revised May 6, 2026 — 7 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Composer
Update cockpit-hq/cockpit to 2.14.0 or later
composer require "cockpit-hq/cockpit:^2.14.0"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: packagist (1).

PackageEcosystemAffectedFixed In
cockpit-hq/cockpit
packagist
2.0.0, 2.0.1, 2.0.2, 2.1.0 (+56 more)2.14.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-434
    Unrestricted File UploadMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

References

Frequently Asked Questions

What is CVE-2026-38991?
Cockpit Vulnerable to Unrestricted Upload of File with Dangerous Type This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.8/10).
How do I check if my project is affected by CVE-2026-38991?
CVE-2026-38991 affects cockpit-hq/cockpit. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-38991 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.8

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-j2rx-4jg9-79mw

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