What’s Vulnerable › Vulnerabilities

CVE-2026-72835: filebrowser before v2.63.21 Access Rule Bypass via Path Canonicalization

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-14 · updated 2026-09-08
• Weakness: CWE-41

Description

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.

Affected products

• filebrowser: before 2.63.21 — fixed in 2.63.21

How to fix

Upgrade to a fixed version: filebrowser 2.63.21. Check the vendor advisory for mitigations.

References

• https://github.com/filebrowser/filebrowser/security/advisories/GHSA-fgm5-pw99-w2p7
• https://www.vulncheck.com/advisories/filebrowser-before-access-rule-bypass-via-path-canonicalization
• https://github.com/filebrowser/filebrowser/security/advisories/GHSA-fgm5-pw99-w2p7

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