Audiobookshelf is a self-hosted audiobook and podcast server. Starting in version 2.17.0 and prior to version 2.19.1, a flaw in the authentication bypass logic allows unauthenticated requests to match certain unanchored regex patterns in the URL. Attackers can craft URLs containing substrings like "/api/items/1/cover" in a query parameter (?r=/api/items/1/cover) to partially bypass authentication or trigger server crashes under certain routes. This could lead to information disclosure of otherwise protected data and, in some cases, a complete denial of service (server crash) if downstream code expects an authenticated user object. Version 2.19.1 contains a patch for the issue.
Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:LI:NA:H8.2/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:HAuthentication
Other
Resource Management