Vulnerability · Published Jun 24, 2026 · Assigned by GitHub_M

CVE-2026-49220Jellyfin: Potential XSS in user management

Medium 5.7

In plain English

A medium-severity cross-site scripting in jellyfin from jellyfin. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).

Severity (CVSS 3.1)5.7Medium

Exploit odds (30 days)0.3%top 73.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
jellyfin	jellyfin	< 10.11.9

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

References

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