CVE-2026-96656 Plex Media Server - Unrestricted File Upload

Plex Media Server < 1.43.3.10861 contains an unrestricted file write vulnerability caused by appending the TranscoderH264Options preference verbatim to x264's option string, letting admin users write arbitrary files that execute on load, exploit requires admin privileges.

CVSS base score 7.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.40% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Unrestricted File Upload
Impact
Remote Code Execution, File System Write
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published
23 September 2026
Updated
15 October 2026
Weakness
CWE-73

Vendor fix

Upgrade to version 1.43.3.10861 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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