CVE-2026-49247CWE-22

Jellyfin: Potential Authenticated path traversal in /ClientLog/Document

High · published June 24, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
45.1
In the wild
Unconfirmed
What it is

Jellyfin is an open source self hosted media server. From 10.9.0 until 10.11.10, the POST /ClientLog/Document endpoint accepts the Authorization header's Client and Version fields and uses them unsanitized as components of the on-disk filename when persisting client-uploaded log documents. As a result, any authenticated non-admin user can include ../ sequences in the Client field to cause Jellyfin to write attacker-controlled content to arbitrary paths reachable by the Jellyfin service user, with a forced .log suffix. This vulnerability is fixed in 10.11.10.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00548 · 45.1th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-06-24T18:18Z
EPSS history
Timeline
  • 24 JUN 18:18Z
    Jellyfin: Potential Authenticated path traversal in /ClientLog/Document
    cvelistv5