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Vulnerability record · CVE-2026-72835 · published 14 August 2026

CVE-2026-72835: filebrowser versions before v2.63.21 fail to canonicalize paths before evaluating access rules, allowing authe…

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.

7.6 CVSS 4.0 High EPSS 0.50% · top 59.6% CWE-41 · CWE-41 Deferred
7.6CVSS 4.0 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
8 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-72835), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.