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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Filebrowser Filebrowser
cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:*
|
— | — |
References 3
https://github.com/filebrowser/filebrowser/commit/72faf6dd3c85628e332d3e567124b…
disclosure@vulncheck.com
https://github.com/filebrowser/filebrowser/security/advisories/GHSA-v3jv-rmh2-6…
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/file-browser-through-jwt-expiration-bypass
disclosure@vulncheck.com