CVE-2026-49220
MediumCVSS 5.7Exploitation Probability (EPSS)
Low risk9th percentile — higher than 9% of all known CVEs
Summary
Jellyfin, an open-source media server, prior to version 10.11.9, had a potential XSS vulnerability that allowed a non-privileged user to execute arbitrary Javascript in the context of a logged-in Administrative user. The attack could occur through the Client header during AuthenticateByName.
Risk Assessment
This vulnerability could lead to serious security issues, including data theft or administrative account takeover, jeopardizing the integrity of the system.
Recommendation
It is recommended to upgrade to version 10.11.9 or later to eliminate this vulnerability and secure the system against potential attacks.
Original NVD description (English source)
Jellyfin is an open source self hosted media server. Prior to 10.11.9, a potential XSS attack exists in Jellyfin which can allow a non-privileged user to execute arbitrary Javascript in the context of a logged-in Administrative user, resulting in numerous potential issues. The Client header during an AuthenticateByName can contain arbitrary HTML and Javascript, which will then be executed by the Administrative user when visiting the Access tab of the user in question from within the dashboard. This vulnerability is fixed in 10.11.9.