A ready-made attack for a flaw in Plex Media Server is now public
KROMSE explanation
Plex Media Server has a security flaw (CVE-2026-96656, CVSS 8.6). The official record says: 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.
Yes. CISA reports active attacks.
Anyone running Plex Media Server older than 1.43.3.10861.
- Do it today: this flaw is being used in attacks.
- Update Plex Media Server to 1.43.3.10861 or later.
- Not sure if you use it? KROMSE can check your product for free.
