Our automated tracking framework flagged that CISA added CVE-2026-96655 (Plex Media Server) to the Known Exploited Vulnerabilities (KEV) catalog on October 24, 2026. A KEV listing is CISA’s official confirmation that the flaw is being exploited in the wild — U.S. federal agencies must patch it by a fixed deadline. Here is what our data shows.
What CISA Reported
CISA describes the flaw as follows: “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.”
Under Binding Operational Directive rules, U.S. federal agencies must remediate CVE-2026-96655 by November 3, 2026 — a 14-day window. Private organizations are not bound by the deadline, but CISA treats it as the benchmark for how urgently a confirmed-exploited flaw should be patched.
The Details
| CVE | CVE-2026-96655 |
| Vendor / product | Plex Media Server |
| Vulnerability | Plex Media Server Server-Side Request Forgery (SSRF) Vulnerability |
| CVSS base score | 4.3 |
| Added to KEV | October 20, 2026 |
| Days public before listing (NVD → KEV lag) | 27 |
| Federal patch deadline | November 3, 2026 |
| Known ransomware use | No |
How This Compares to Plex’s Track Record
This one was public for 27 days before CISA confirmed exploitation — longer than Plex’s 27-day median, a vulnerability that sat exploitable in the open.
| Plex in the CISA KEV catalog | Value |
|---|---|
| Tracked KEV entries | 5 |
| Median lag (public → KEV listing) | 27 days |
| 0-day rate (exploited at or before disclosure) | 0% |
| Entries tied to known ransomware campaigns | 0 |
For perspective, the median across all 1756 tracked KEV entries is 237 days — Plex’s exploited vulnerabilities are flagged faster than the catalog average.
Other Recent Plex KEV Additions
The most recent Plex vulnerabilities CISA has confirmed as actively exploited, from our tracker:
| CVE | Product | Added to KEV | Lag (days) | Ransomware |
|---|---|---|---|---|
| CVE-2026-96652 | Media Server | October 20, 2026 | 27 | No |
| CVE-2026-96654 | Media Server | October 20, 2026 | 27 | No |
| CVE-2026-96656 | Media Server | October 20, 2026 | 27 | No |
| CVE-2020-5741 | Media Server | March 10, 2023 | 1036 | No |
What This Means for Defenders
CISA has added CVE-2026-96655, a vulnerability in Plex Media Server, to its Known Exploited Vulnerabilities (KEV) catalog. With a CVSS base score of 4.3, this vulnerability requires prompt action, especially for organizations using Plex in internet-facing capacities. Federal agencies must patch by November 3, 2026. This vulnerability was public for 27 days before its KEV listing, indicating that active exploitation began within that period. Organizations that haven’t patched are at heightened risk; no known ransomware use is associated with this CVE.
Patch all instances of Plex Media Server before November 3, 2026. If you can’t patch immediately, restrict network access to Plex Media Server instances. You can do this by isolating them within a demilitarized zone (DMZ) and limiting access to only essential ports and trusted IP addresses. Also, monitor for unusual outbound connections from the server and analyze logs for suspicious activity.
Related Coverage
- Plex’s CVE-2026-96656 Was Exploited in 27 Days — Exactly Its Historical Median (October 2026)
- Plex’s CVE-2026-96654 Was Exploited in 27 Days — Exactly Its Historical Median (October 2026)
How We Track This
This report was generated from our CISA KEV Lag Tracker, which syncs the official CISA KEV catalog daily and records the date each CVE is added. For every entry we retrieve the original NVD publication date and compute the lag in calendar days. No dates or figures on this page are estimated or taken from third-party sources — they come directly from CISA and NVD records.
