What is CVE-2026-73611?

CVE-2026-73611 is a medium-severity vulnerability in Filebrowser, classified under Insufficient Session Expiration. CVSS score: 6.8/10. Published 2026-08-13.

How severe is CVE-2026-73611?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Filebrowser

CVE-2026-73611

File Browser versions from 2.50.0 through 2.63.21 fail to validate JWT expiration when proxy authentication is configured with a non-default logout page. Attackers with a previously valid token can access protected routes and administrative endpoints indefinitely, and exchange expired tokens for fresh ones via the renewal endpoint.

Published 2026-08-13 · last modified 2026-09-08.

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: 0.004 (35.2th percentile), scored 2026-09-27.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.2% 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: 0.004 · change: +0.002

Affected products

Filebrowser — versions 0

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

github.com/filebrowser/filebrowser/security/advisories/GHSA-v3jv-rmh2-635j (vendor-advisory)
github.com/filebrowser/filebrowser/commit/72faf6dd3c85628e332d3e567124b86708ce2… (patch)
www.vulncheck.com/advisories/file-browser-through-jwt-expiration-bypass (third-party-advisory)

Frequently asked questions

What is CVE-2026-73611?: CVE-2026-73611 is a medium-severity vulnerability in Filebrowser, classified under Insufficient Session Expiration. CVSS score: 6.8/10. Published 2026-08-13.
How severe is CVE-2026-73611?: Medium severity. CVSS v3 base score is 6.8 out of 10.