Authorization bypass through user-controlled key in Jellyfin - #VU151795
Published: September 23, 2026
Vulnerability identifier: #VU151795
CSH Severity: Medium
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to broken access control in session remote-control API. A remote user can provide the target session ID to control another user's session, send popups, control playback and execute system commands.
Affected software
Jellyfin
Remediation
Install updates from vendor's website.