CVE-2026-49247
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 products
- Jellyfin
- Fix
- Available
- CVSS 3.1
- 8.8 HIGH
- EPSS
- 0.5% (44th percentile)
- Weakness
- CWE-22
- NVD status
- Deferred
- Published
- 2026-06-24
No indexed exploits for CVE-2026-49247 yet
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