CVE-2026-96656

HIGH7.2

CISA KEV

Published 2026-09-23 · Updated 2026-10-21 · Source 9119a7d8-5eab-497f-8521-727c672e3725

Summary

CVE-2026-96656 is a high-severity (CVSS 7.2) vulnerability in Plex Media Server. CISA added it to the Known Exploited Vulnerabilities catalog on October 20, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by October 23, 2026. CISA does not currently list it as used in ransomware campaigns. Plex has 5 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 5 known-exploited Plex vulnerabilities →

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.

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

CWE-73

CISA Known-Exploited Vulnerability

Product: Plex — Media Server

Name: Plex Media Server External Control of File Name or Path Vulnerability

Date added: 2026-10-20 · Due: 2026-10-23

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

References

View on NVD

More exploited Plex vulnerabilities

Most recently added to CISA KEV

CVE-2026-96655
Media Server — Plex Media Server Server-Side Request Forgery (SSRF) Vulnerability
added 2026-10-20
CVE-2026-96654
Media Server — Plex Media Server Improper Neutralization of Encoded URI Schemes in a Web Page Vulnerability
added 2026-10-20
CVE-2026-96652
Media Server — Plex Media Server Server-Side Request Forgery (SSRF) Vulnerability
added 2026-10-20
CVE-2020-5741
Media Server — Plex Media Server Remote Code Execution Vulnerability
added 2023-03-10

View all →

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