CVE-2026-96655

Plex Media Server arbitrary-host SSRF

MEDIUM

4.3

CVSS Score

Published: September 23, 2026 at 04:06 PM UTC

Updated: October 21, 2026 at 01:09 PM UTC

1 product affected across 1 vendorMedia Server

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Severity

MEDIUM4.3

Exploitation

CISA KEV

Exploit prediction

EPSS 2%

SSVC

No known exploit

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score1.6%

EPSS (Exploit Prediction Scoring System) estimates a 1.6% chance this CVE is exploited in the wild within the next 30 days — higher than 76% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Plex Media Server contains a server-side request forgery (SSRF) vulnerability that could allow an authenticated user to request arbitrary internal or external addresses via the '/video/:/transcode/universal' path parameter. This vulnerability can be chained with CVE-2026-96652, CVE-2026-96654, and CVE-2026-96656.

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.

Ransomware Use

Unknown

Added to KEV

Oct 20, 2026

Remediation Due

Nov 3, 2026

3 days remaining

Notes

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-2026-96655

Description

Plex Media Server before 1.43.3.10861 allows an authenticated user to request arbitrary internal or external addresses via the '/video/:/transcode/universal' path parameter.