CVE-2026-49247 Details
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.
A path traversal vulnerability has been identified in Jellyfin versions 10.9.0 prior to 10.11.10. The issue arises in the POST /ClientLog/Document endpoint, where the Authorization header's Client and Version fields are used unsanitized to create on-disk filenames for client-uploaded log documents. This allows authenticated non-admin users to manipulate the Client field with ../ sequences, directing Jellyfin to save attacker-controlled content to arbitrary paths accessible by the Jellyfin service user, appending a .log suffix. This vulnerability is similar to CVE-2023-30626, which was patched in April 2023, but the fix was not properly backported to the master branch, leaving this vulnerability unaddressed in the affected versions.
Users can upgrade to Jellyfin version 10.11.10 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 24, 2026CISA-ADP
Assessed Jun 25, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/jellyfin/jellyfin/security/advisories/GHSA-jg92-mrxq-vv75 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Jellyfin | >= 10.9.0, < 10.11.10 (semver) |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 26, 2026 | CVE Modified | CISA-ADP |
| Jun 25, 2026 | CVE Modified | CISA-ADP |
| Jun 24, 2026 | New CVE Received | [email protected] |