github.comConfirmation
https://github.com/jellyfin/jellyfin/security/advisories/GHSA-jg92-mrxq-vv75 CVE-2026-49247
HIGH
Jellyfin: Potential Authenticated path traversal in /ClientLog/Document
Record summary
CVE-2026-49247 has a selected CVSS score of 8.8 (high).
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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableNo
Technical impactTotal
CISA Coordinator · SSVC 2.0.3 · Evaluated Jun 25, 2026 · Source: CVE List
Affected products and versions
1| Product | Source | Version range | Status |
|---|---|---|---|
jellyfinBrowse jellyfin / jellyfin | CVE List | >= 10.9.0, < 10.11.10 | affected |