CVE-2026-49220CWE-79

Jellyfin: Potential XSS in user management

Medium · published June 24, 2026

CVSS v3.1
5.7
EPSS
0%
Percentile
25.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.7 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00334 · 25.5th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-06-24T18:23Z
EPSS history
Timeline
  • 24 JUN 18:23Z
    Jellyfin: Potential XSS in user management
    cvelistv5