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.

Attack Vector Network

Attack Complexity Low

Privileges Required High

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Plex Media Server unknown
Version Status Constraints
0 affected < 1.43.3.10861
1.43.3.10861 unaffected —

No data.

No data.

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Vendors Products
Plex Subscribe
Media Server Subscribe

Project Subscriptions

Vendors Products
Plex Subscribe
Media Server Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://forums.plex.tv/t/plex-media-server/30447/711 cve-icon cve-icon
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-266-01.json cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-96656 cve-icon cve-icon
https://zmain.info/blog/plex2shell cve-icon cve-icon
History

Wed, 23 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
First Time appeared Plex
Plex media Server
Vendors & Products Plex
Plex media Server

Wed, 23 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 23 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Plex Media Server arbitrary file write
Weaknesses CWE-73
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisa-cg

Published:

Updated: 2026-09-23T16:46:12.908Z

Reserved: 2026-09-23T14:42:33.270Z

Link: CVE-2026-96656

cve-icon Vulnrichment

Updated: 2026-09-23T16:36:16.975Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-23T17:17:23.840

Modified: 2026-09-23T17:58:26.570

Link: CVE-2026-96656

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-23T18:15:07Z

Weaknesses