SSRF in Plex Media Server

CVE-2026-96655

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.016 (76.4th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-96655: rose from 0.002 to 0.016.

EPSS over last 30 days · oldest: 0.002 · newest: 0.016 · change: +0.014

Affected products

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

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

Frequently asked questions

What is CVE-2026-96655?
CVE-2026-96655 is a medium-severity vulnerability in Plex Media Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.3/10. Published 2026-09-23.
How severe is CVE-2026-96655?
Medium severity. CVSS v3 base score is 4.3 out of 10.
Is CVE-2026-96655 known to be exploited?
Yes. CVE-2026-96655 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-10-20), indicating it is being actively exploited.