CVE-2021-29490: Jellyfin

Medium severity, CVSS 5.8. EPSS: 69.9% chance of exploitation in the next 30 days.

Jellyfin is a free software media system that provides media from a dedicated server to end-user devices via multiple apps. Verions prior to 10.7.3 vulnerable to unauthenticated Server-Side Request Forgery (SSRF) attacks via the imageUrl parameter. This issue potentially exposes both internal and external HTTP servers or other resources available via HTTP `GET` that are visible from the Jellyfin server. The vulnerability is patched in version 10.7.3. As a workaround, disable external access to the API endpoints `/Items/*/RemoteImages/Download`, `/Items/RemoteSearch/Image` and `/Images/Remote` via reverse proxy, or limit to known-friendly IPs.

Affected products

• Jellyfin Jellyfin: before 10.7.3 (fixed in 10.7.3)

Published 2021-05-06. Last modified 2026-06-17.