Plex Media Server External Control of File Name or Path Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 20/10/2026. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| media server | < 1.43.3.10861 | 1.43.3.10861 |
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.
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