CVE-2026-49220

Jellyfin: Potential XSS in user management

State: Published
Severity: 5.7 Medium
Published: Jun 24, 2026
Updated: Jun 24, 2026
Reserved: May 28, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.7 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
jellyfinjellyfin	< 10.11.9Affected

References

https://github.com/jellyfin/jellyfin/security/advisories/GHSA-fv79-gmhx-xh2v

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