CVE Watch21 oct 2026

CVE-2026-96656

Plex Media Server External Control of File Name or Path Vulnerability

CVSS

7.2

Alto

EPSS

1.8%

p78

KEV

SÍ

20 oct 2026

Exploit Today

0-100

Publicado: 23 sept 2026 · Última mod.: 21 oct 2026 · CWE-73

EPSS · 30d

0.4%EPSS · 30 días1.8%

2026-10-122026-11-09

Ficha del catálogo KEV

Producto

Plex / Media Server

Vulnerabilidad

Plex Media Server External Control of File Name or Path Vulnerability

Añadido a KEV

20 oct 2026

Remediar antes de

23 oct 2026

Uso conocido en ransomware

Descripción resumida

Plex Media Server contains an external control of file name or path vulnerability which can allow an admin user to write arbitrary files that may be executed on load. This vulnerability can be chained with CVE-2026-96652, CVE-2026-96654, and CVE-2026-96655.

Acción requerida

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.

Notas

https://forums.plex.tv/t/important-security-update-for-plex-media-server-v1-43-2-and-earlier/942319 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-96656

Descripción técnica

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.

Referencias oficiales

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