Our automated tracking framework flagged that CISA added CVE-2026-96654 (Plex Media Server) to the Known Exploited Vulnerabilities (KEV) catalog on October 22, 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 an improper neutralization of encoded URI schemes in a web page vulnerability that could allow an attacker to call other plugins’ functions and supply their own parameters. This vulnerability can be chained with CVE-2026-96652, CVE-2026-96655, and CVE-2026-96656.”
Under Binding Operational Directive rules, U.S. federal agencies must remediate CVE-2026-96654 by October 23, 2026 — a 3-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-2026-96654 |
| Vendor / product | Plex Media Server |
| Vulnerability | Plex Media Server Improper Neutralization of Encoded URI Schemes in a Web Page Vulnerability |
| CVSS base score | 6.5 |
| Added to KEV | October 20, 2026 |
| Days public before listing (NVD → KEV lag) | 27 |
| Federal patch deadline | October 23, 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 1754 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-2026-96655 | 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-2026-96654, affecting Plex Media Server, to its Known Exploited Vulnerabilities (KEV) catalog. With a CVSS base score of 6.5, it’s a significant risk. Federal agencies must patch by October 23, 2026, just three days after its October 20 KEV inclusion. All organizations using Plex Media Server should patch immediately. The vulnerability was public for 27 days before being listed in KEV.
Its KEV listing confirms active exploitation. This isn’t known to be used by ransomware. Given the tight patching deadline for federal agencies, it’s critical for all organizations to address this promptly.
If you can’t patch before the deadline, restrict network access to affected Plex Media Server instances to trusted users and IP ranges. Monitor server logs for suspicious activity to mitigate potential risks associated with this actively exploited flaw.
Related Coverage
- Plex’s CVE-2026-96656 Was Exploited in 27 Days — Exactly Its Historical Median (October 2026)
- Critical Microsoft SharePoint Flaw CVE-2026-50522 (CVSS 9.8) Added to CISA KEV (July 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.
