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9.3
CVE-2026-72839: Filebrowser 2.63.16 allows unauthorized access to all files
CVE-2026-72839 · published 21 days ago
Summary
An attacker can create an account with full access to all files on the server, even if they're not supposed to have any permissions. This is a significant risk because it allows unauthorized access to sensitive data. To fix this, update Filebrowser to version 2.63.17 or later.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| filebrowser | filebrowser | <= 2.63.16 |
Original advisory text
filebrowser through 2.63.16 Privilege Escalation via Signup
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.
References
- https://github.com/filebrowser/filebrowser/security/advisories/GHSA-6759-996p-gp...
- https://www.vulncheck.com/advisories/filebrowser-through-privilege-escalation-vi...
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72839... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-72839 Vendor Advisory
Severity
9.3
Critical
CVSS 3.1: 9.8 (NVD)
CVSS 4.0: 9.3 (NVD)
CVSS 4.0: 9.9 (OSV)
Exploitation
EPSS <1%
Type
CWE-266Incorrect Privilege Assignment
Timeline
Published13 Aug 2026
Updated3 Sep 2026
First seen13 Aug 2026
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