Vulnerability in Filebrowser
CVE-2026-72837
File Browser versions before 2.63.20 fail to honor the createUserDir isolation in proxy and hook authentication auto-provisioning paths. Attackers with valid upstream-authenticated credentials can read, modify, delete, and share files belonging to other users by exploiting the server root scope assignment.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
- Filebrowser — versions 0, 2.63.20
Weakness classification (CWE)
References
- github.com/filebrowser/filebrowser/security/advisories/GHSA-j7jh-37pf-mf8h (vendor-advisory)
- www.vulncheck.com/advisories/file-browser-before-privilege-escalation-via-proxy… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-72837?
- CVE-2026-72837 is a high-severity vulnerability in Filebrowser, classified under Improper Access Control. CVSS score: 8.8/10. Published 2026-08-14.
- How severe is CVE-2026-72837?
- High severity. CVSS v3 base score is 8.8 out of 10.