What CISA has confirmed
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.
Known exploited: Yes — this CVE appears in CISA’s Known Exploited Vulnerabilities catalog. This does not by itself establish a CVSS score.
Recommended next steps
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.
Verify the advisory and affected versions
Confirm the affected product and version, then follow the vendor’s official security advisory. Do not assume this notice confirms a patch is already available.