CVE-2026-38991
Last modified
CVE-2026-38991 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Cockpit 2.13.5 and earlier is 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.. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
Description
Cockpit 2.13.5 and earlier is 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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-38991?
How severe is CVE-2026-38991?
How do I fix CVE-2026-38991?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-38972Notepad3 through 6.25.822.1 contains a DLL search-order hija…7.8
- CVE-2026-38973mrubyc through release3.4.1 was found to contain an out-of-b…4.4
- CVE-2026-38974Dulwich through 1.1.0 was found to be missing SSH host key v…5.3
- CVE-2026-38976mrubyc through 3.4.1 was found to contain a NULL pointer der…7.5
- CVE-2026-38978transmission through 4.1.1 was found to have a clickjacking …5.3
- CVE-2026-38979ajenti through v2.2.13 has a clickjacking weakness in the br…5.4
- CVE-2026-38992Cockpit v2.13.5 and earlier is vulnerable to arbitrary code …9.8
- CVE-2026-38993Cockpit 2.13.5 and earlier is vulnerable to directory traver…6.5
- CVE-2026-39006An issue in SNMP4J-Agent 3.8.3 allows a remote attacker to e…9.8
- CVE-2026-39007An issue in Observeinc's Observe v.2026-01-28 and before all…7.5
- CVE-2026-3902An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.…7.5
- CVE-2026-3903The Modular DS: Monitor, update, and backup multiple website…4.3
Are you affected by CVE-2026-38991?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST