Vulnerability in Filebrowser
CVE-2026-72835
filebrowser versions before v2.63.21 fail to canonicalize paths before evaluating access rules, allowing authenticated users to bypass administrator-defined deny rules using case-variant or backslash-separated paths. Attackers can request files with alternate path representations that match no rule but resolve to the same filesystem object, gaining unauthorized access to denied files within their scope.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.4% 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: 0.005 · change: +0.002
Affected products
- Filebrowser — versions 0, 2.63.21
Weakness classification (CWE)
References
- github.com/filebrowser/filebrowser/security/advisories/GHSA-fgm5-pw99-w2p7 (vendor-advisory)
- www.vulncheck.com/advisories/filebrowser-before-access-rule-bypass-via-path-can… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-72835?
- CVE-2026-72835 is a medium-severity vulnerability in Filebrowser, classified under CWE-41. CVSS score: 6.8/10. Published 2026-08-14.
- How severe is CVE-2026-72835?
- Medium severity. CVSS v3 base score is 6.8 out of 10.