CVE-2026-96656 Plex Media Server arbitrary file write
- Published
- Updated
- Exploit status
- Exploited in the wild (confirmed)
Description
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.
CISA Known Exploited Vulnerability
- Date added
- 2026-10-20
- Due date (FCEB)
- 2026-10-23
- Ransomware use
- Unknown
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
| Product | Affected versions | Fixed in |
|---|---|---|
| Plex Media Server | < 1.43.3.10861 | 1.43.3.10861 |
References
- url release-notes
- url third-party-advisory vdb-entry
- url third-party-advisory
- url third-party-advisory
- www.boredhackerblog.info third-party-advisory
- www.cisa.gov government-resource us-government-resource