Audiobookshelf is a self-hosted audiobook and podcast server. Prior to 2.7.0, Audiobookshelf is vulnerable to unauthenticated blind server-side request (SSRF) vulnerability in Auth.js. This vulnerability has been addressed in version 2.7.0. There are no known workarounds for this vulnerability.
https://github.com/advplyr/audiobookshelf/security/advisories/GHSA-gjgj-98v3-47pg
https://github.com/advplyr/audiobookshelf/commit/728496010cbfcee5b7b54001c9f79e02ede30d82