CVE-2026-49247 — Jellyfin: Potential Authenticated path traversal in /ClientLog/Document

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
jellyfin / jellyfin	affected >= 10.9.0, < 10.11.10

CWE

CWE-22

References

https://github.com/jellyfin/jellyfin/security/advisories/GHSA-jg92-mrxq-vv75

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.