Server-Side Request Forgery (SSRF) in Jellyfin - CVE-2021-29490

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Main Vulnerability Database Vulnerabilities #VU126124

Server-Side Request Forgery (SSRF) in Jellyfin - CVE-2021-29490

Published: May 5, 2021 / Updated: April 15, 2026


Vulnerability identifier: #VU126124
CSH Severity: Medium
CVSSv4.0: 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/E:U/U:Green
CVE-ID: CVE-2021-29490
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Jellyfin
Software vendor:
Jellyfin

Description

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.


Remediation

Install security update from vendor's website.

External links