CVE-2026-96656
Plex Media Server arbitrary file write
Plex·Media Server
- Added
- Oct 20, 2026
- Fix due
- Oct 23, 2026
- Ransomware
- Not known
- Published
- Sep 23, 2026
- Updated
- Oct 21, 2026
- First covered
- Oct 20, 2026
- Latest story
- 5 days ago
Summary
Plex Media Server before 1.43.3.10861 allows an admin user to write arbitrary files that may be executed on load. The preference TranscoderH264Options is appended verbatim to x264's option string on every transcode. At startup, all .so files are run without signature, execute bit, or symbol checks.
CWE-73External Control of File Name or Path
Attack profile
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HCISA required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Affected products
- Plex Media Serverbefore 1.43.3.10861