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… (CVE-2026-73611)
File Browser versions 2.50.0 through 2.63.21 contain a vulnerability where JWT expiration is not validated if proxy authentication is configured with a non-default logout page. This allows attackers with previously valid tokens to access protected and administrative routes indefinitely and to renew expired tokens via the renewal endpoint.
AI Analysis
Technical Summary
File Browser versions from 2.50.0 through 2.63.21 fail to validate JSON Web Token (JWT) expiration when proxy authentication is configured with a non-default logout page. This flaw enables attackers possessing previously valid tokens to maintain indefinite access to protected routes and administrative endpoints. Additionally, attackers can exchange expired tokens for fresh ones through the token renewal endpoint, bypassing intended expiration controls. The vulnerability is tracked as CVE-2026-73611 and is associated with CWE-613 (Insufficient Session Expiration).
Potential Impact
Attackers with previously valid JWTs can bypass token expiration controls, maintaining unauthorized access to protected and administrative areas indefinitely. They can also renew expired tokens, extending their access without re-authentication. This leads to high confidentiality and integrity impact, as unauthorized users may access sensitive data and perform administrative actions. Availability impact is not affected.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid configuring proxy authentication with non-default logout pages or restrict token renewal endpoints to trusted users only. Monitor for updates from the vendor regarding an official fix.
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… (CVE-2026-73611)
Description
File Browser versions 2.50.0 through 2.63.21 contain a vulnerability where JWT expiration is not validated if proxy authentication is configured with a non-default logout page. This allows attackers with previously valid tokens to access protected and administrative routes indefinitely and to renew expired tokens via the renewal endpoint.
CVSS v3.1
Score 6.8medium
Affected software
pkg:github/filebrowser/filebrowserRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
File Browser versions from 2.50.0 through 2.63.21 fail to validate JSON Web Token (JWT) expiration when proxy authentication is configured with a non-default logout page. This flaw enables attackers possessing previously valid tokens to maintain indefinite access to protected routes and administrative endpoints. Additionally, attackers can exchange expired tokens for fresh ones through the token renewal endpoint, bypassing intended expiration controls. The vulnerability is tracked as CVE-2026-73611 and is associated with CWE-613 (Insufficient Session Expiration).
Potential Impact
Attackers with previously valid JWTs can bypass token expiration controls, maintaining unauthorized access to protected and administrative areas indefinitely. They can also renew expired tokens, extending their access without re-authentication. This leads to high confidentiality and integrity impact, as unauthorized users may access sensitive data and perform administrative actions. Availability impact is not affected.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid configuring proxy authentication with non-default logout pages or restrict token renewal endpoints to trusted users only. Monitor for updates from the vendor regarding an official fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-32pr-94pq-34pj
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-73611"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a7e0379bf8831d5398fa27c
Added to database: 08/13/2026, 17:48:41 UTC
Last enriched: 08/13/2026, 18:15:28 UTC
Last updated: 08/13/2026, 19:49:42 UTC
Views: 3
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