Description
Seerr is an open-source media request and discovery manager for Jellyfin, Plex, and Emby. Starting in version 2.0.0 and prior to version 3.1.0, an authentication guard logic flaw in `POST /api/v1/auth/jellyfin` allows an unauthenticated attacker to register a new Seerr account on any Plex-configured instance by authenticating with an attacker-controlled Jellyfin server. The attacker receives an authenticated session and can immediately use the application with default permissions, including the ability to submit media requests to Radarr/Sonarr. Any Seerr deployment where all three of the following are true may be vulnerable: `settings.main.mediaServerType` is set to `PLEX` (the most common deployment).; `settings.jellyfin.ip` is set to `""` (default, meaning Jellyfin was never configured); and `settings.main.newPlexLogin` is set to `true` (default). Jellyfin-configured and Emby-configured deployments are not affected. Version 3.1.0 of Seerr fixes this issue.
INFO
Published Date :
2026-02-27T19:29:18.768Z
Last Modified :
2026-02-27T20:22:24.091Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-27707 vulnerability.
| Vendors | Products |
|---|---|
| Seerr |
|
| Seerr-team |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-27707.
