CVE-2021-29490: Unauthenticated GET requests through Remote Image endpoints

Severity: medium (CVSS 5.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 69.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-05-06 · updated 2026-06-17
Weakness: CWE-918

Description

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: before 10.7.3 — fixed in 10.7.3

How to fix

Upgrade to a fixed version: jellyfin 10.7.3. Check the vendor advisory for mitigations.

References

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