CVE-2026-27793 Seerr has Broken Object-Level Authorization in User Profile Endpoint that Exposes Third-Party Notification Credentials

Medium 6.5 Published 27 Feb 2026 Updated 2 Mar 2026

Authenticated users can access other users' third-party notification credentials via an unprotected API endpoint, potentially leading to account takeover.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-27793?

CVE-2026-27793 is a medium-severity missing authorization vulnerability in seerr-team seerr, published on 27 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Seerr is an open-source media request and discovery manager for Jellyfin, Plex, and Emby. Prior to version 3.1.0, the `GET /api/v1/user/:id` endpoint returns the full settings object for any user, including Pushover, Pushbullet, and Telegram credentials, to any authenticated requester regardless of their privilege level. This vulnerability can be exploited alone or combined with the reported unauthenticated account creation vulnerability, CVE-2026-27707. When combined, the two vulnerabilities create a zero-prior-access chain that leaks third-party API credentials for all users, including administrators. Version 3.1.0 contains a fix for both this vulnerability and for CVE-2026-27707.

Weakness: CWE-639

Which versions are affected by CVE-2026-27793?

It affects 1 product.

Products include Seerr Seerr.

How do I fix CVE-2026-27793?

No fix has been published for CVE-2026-27793 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-27793 being exploited?

There is no known exploitation of CVE-2026-27793 in the wild and no public exploit code.

Sources

Also known as GHSA-f7xw-jcqr-57hp.