Privilege escalation in Filebrowser
CVE-2026-72839
filebrowser through 2.63.16 fails to properly restrict scope and permissions when self-signup is enabled with default CreateUserDir setting. Unauthenticated attackers can register accounts that inherit the server root scope with full create, modify, delete, rename, share, and download permissions, allowing unrestricted access to all files.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Filebrowser — versions 0
Weakness classification (CWE)
References
- github.com/filebrowser/filebrowser/security/advisories/GHSA-6759-996p-gpj6 (vendor-advisory)
- www.vulncheck.com/advisories/filebrowser-through-privilege-escalation-via-signup (third-party-advisory)
Frequently asked questions
- What is CVE-2026-72839?
- CVE-2026-72839 is a critical-severity vulnerability in Filebrowser, classified under Incorrect Privilege Assignment. CVSS score: 9.8/10. Published 2026-08-13.
- How severe is CVE-2026-72839?
- Critical severity. CVSS v3 base score is 9.8 out of 10.