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    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.

    Published:Jun 24, 2026
    Last Modified:Jun 25, 2026
    EPS:Jun 24, 2026
    EPSS Score:0.00344
    CVSS Score:8.8

    Affected Products

    Vendor
    Jellyfin
    Product
    Jellyfin

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-49220 (CVSS 5.7) — Jellyfin is an open source self hosted media server. Prior to 10.11.9, a potential XSS attack exists in Jellyf…
    CVE-2026-48793 (CVSS 8.8) — Jellyfin is an open source self hosted media server. Prior to 10.11.10, a potential FFmpeg argument injection …
    CVE-2026-49246 (CVSS 1.7) — Jellyfin is an open source self hosted media server. Prior to 10.11.10, a specifically crafted MKV file contai…
    CVE-2026-35034 (CVSS 6.5) — Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a denial of service vul…
    CVE-2026-35033 (CVSS 9.3) — Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain an unauthenticated arbi…
    CVE-2026-35032 (CVSS 8.6) — Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a vulnerability chain i…
    CVE-2026-35031 (CVSS 9.9) — Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a vulnerability chain i…
    CVE-2026-31852 (CVSS 10) — Jellyfin is an open-source media system. The code-quality.yml GitHub Actions workflow in jellyfin/jellyfin-ios…
    CVE-2025-31499 (CVSS 7.6) — Jellyfin is an open source self hosted media server. Versions before 10.10.7 are vulnerable to argument inject…
    CVE-2025-32012 (CVSS 4.6) — Jellyfin is an open source self hosted media server. In versions 10.9.0 to before 10.10.7, the /System/Restart…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High