# CVE-2026-96656

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.

- Page: https://www.vulneraibility.com/cve/CVE-2026-96656
- CVSS: 7.2
- Known exploited: yes, in CISA KEV since 2026-10-20; CISA due date 2026-10-23
- EPSS: 1.79%
- Unvetted proof-of-concept code on GitHub: 1 GitHub proof of concept (first 2026-10-18)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2026-10-19)
- Weakness: CWE-73
- Published: 2026-09-23

## Affected versions

- Plex Media Server: affected < 1.43.3.10861; fixed in 1.43.3.10861

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://forums.plex.tv/t/plex-media-server/30447/711
- [other] https://www.cve.org/CVERecord?id=CVE-2026-96656
- [advisory] https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-266-01.json
- [advisory] https://zmain.info/blog/plex2shell
- [advisory] https://www.boredhackerblog.info/2026/10/plex-vulnerabilities-being-exploited-in.html
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-96656

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.