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.

CVSS 4.0

8.6CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

7.2CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS

1.8% chance of exploitation in the next 30 days; higher than 78% of CVEs (scores of 2026-10-25)

CISA KEV

listed 2026-10-20, due 2026-10-23

CWE

CWE-73

Published

2026-09-23

Modified

2026-10-21

Record from

the NVD, synced 2026-10-22

Affected

• plex:media_server

References

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

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