Plex Media Server Server-Side Request Forgery (SSRF) Vulnerability (CVE-2026-96655)
Severity: medium · Patch status: unknown · Since 2026-10-20 · CVE-2026-96655
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. CISA added CVE-2026-96655 to its Known Exploited Vulnerabilities catalog on Oct 20, 2026, which means attackers are exploiting it in the wild.
What to do
- 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.
- US federal agencies must remediate by Nov 3, 2026 (BOD 22-01); treat that as the outer limit.
Sources
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