Server-Side Request Forgery (SSRF) in Jellyfin - CVE-2021-29490
Published: May 5, 2021 / Updated: April 15, 2026
Vulnerability identifier: #VU126124
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N]
CVE-ID: CVE-2021-29490
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information from internal and external HTTP resources.
The vulnerability exists due to server-side request forgery in the Remote Image endpoints when handling unauthenticated GET requests with a user-supplied imageUrl parameter. A remote attacker can send a specially crafted request to disclose sensitive information from internal and external HTTP resources.
The issue affects the endpoints /Images/Remote, /Items/RemoteSearch/Image, and /Items/{itemId}/RemoteImages/Download, and can also be used to enumerate reachable HTTP services.
Affected software
Jellyfin
How to mitigate CVE-2021-29490
Install security update from vendor's website.
Jellyfin - update to 10.7.3