CVE-2026-49247
HIGHCVSS v3.1: 8.8 · EPSS: 0.0034 (26.3 percentile)
Source data as of:
At a glance
- Severity
- HIGH
- CVSS
- 8.8 v3.1 · NVD
- EPSS
- 0.0034 (26.3 percentile) · FIRST.org
- CISA KEV
- No
- Type
- Path Traversal · NVD CWE
- Attack conditions (CVSS vector)
- NetworkNo user interaction · Source: NVD Vector
- Published
- 2026-06-24 · Modified: 2026-06-25
- References
- Jump to references (1)
CVSS / EPSS / KEV
Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources
Description
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.
References
Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.