Threat Intelligence Report — October 21, 2026 | 7 New KEVs · 243 Victims

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Report Date: 2026-10-21

New KEVs: 7  ▲ +6 vs last weekRansomware Victims: 243  ▼ -24 vs last week

7 vulnerabilities were added to the CISA Known Exploited Vulnerabilities catalog this period. Plex products show the strongest concentration of risk signals this week. Ransomware activity is moderate with 243 new victims posted to leak sites over the last 7 days, with N0N posting the most victims.

On this page

  1. Patch This Week
  2. Top KEVs
  3. Security News
  4. Ransomware Activity
  5. Vendor-Specific Risks

Patch This Week

The top 3 KEVs to remediate right now, ranked by CISA deadline proximity, ransomware exploitation, and severity. These are confirmed exploited — if you do nothing else today, patch these.

  1. CVE-2026-21589 – Atlassian Multiple Products | CVSS 9.3 | EPSS 12.7% / 96th pct
    CISA deadline: 2026-10-18 (overdue by 3d) — 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.
  2. CVE-2026-102764 – BeyondTrust Remote Support | CVSS 9.3 | EPSS 1.2% / 67th pct
    CISA deadline: 2026-10-19 (overdue by 2d) — 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.
  3. CVE-2025-61624 – Fortinet Multiple Products | CVSS 6.0 | EPSS 1.1% / 65th pct
    CISA deadline: 2026-10-19 (overdue by 2d) — 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.

Top KEVs

Vulnerabilities confirmed actively exploited in the wild by CISA — ranked by ransomware use, then severity. Patch these before anything else.

This Reporting Window

  • CVE-2026-102764 – BeyondTrust Remote Support | CVSS 9.3 (CRITICAL) | AV: Network | EPSS 1.2% / 67th pct | Ransomware Use: No
  • CVE-2026-21589 – Atlassian Multiple Products | CVSS 9.3 (CRITICAL) | AV: Network | EPSS 12.7% / 96th pct | Ransomware Use: No
  • CVE-2026-96656 – Plex Media Server | CVSS 8.6 (HIGH) | AV: Network | EPSS 0.8% / 55th pct | Ransomware Use: No
  • CVE-2026-106931 – EG Secure Solutions SiteGuard Server Edition | CVSS 8.5 (HIGH) | AV: Local | EPSS 1.4% / 72th pct | Ransomware Use: No
  • CVE-2026-110936 – Siemens Software Center | CVSS 8.4 (HIGH) | AV: Local | EPSS 0.3% / 17th pct | Ransomware Use: No
  • CVE-2026-96654 – Plex Media Server | CVSS 6.9 (MEDIUM) | AV: Network | EPSS 0.4% / 36th pct | Ransomware Use: No
  • CVE-2025-61624 – Fortinet Multiple Products | CVSS 6.0 (MEDIUM) | AV: Local | EPSS 1.1% / 65th pct | Ransomware Use: No

Security News

Advisories, threat research, and incident reports from 12 sources across government, commercial research, and security journalism — prioritized by source credibility.

Ransomware Activity

Victim counts posted to ransomware group leak sites — use this to gauge which groups are most active and which sectors and regions are being targeted.

25 new victims posted today
7-day total: 243 via Ransomware.live

Most Active Groups

N0N 58 Thegentlemen 37 Qilin 29 Helix 9 Iah6477 8

Group Intelligence

  • Thegentlemen — The Gentlemen is a RaaS group that emerged in July–August 2025, rapidly claiming over 320 victims across 17+ countries by offering affiliates a 90% revenue share, deploying a Go-based locker against Windows, Linux, NAS, and BSD systems; a compromised C2 server in 2026 revealed more than 1,570 linked victims.
  • Qilin — Qilin ransomware was first observed in July of 2022. Qilin Ransomware is written in Golang and supports multiple encryption modes; all of which are controlled by the operator. Qilin actors practice double extortion – demanding payment for a decryptor, as well as for the non-release of stolen data.

Most Targeted Sectors

Manufacturing 30 Technology 27 Healthcare 24 Professional Services 21 Financial Services 12

Top Countries

US (112), BR (9), GB (8), DE (7), CA (4)

Notable Incidents

Vendor-Specific Risks

Vendors with confirmed KEV exploitation this week — the stacked bar shows how that exposure breaks down across exploited CVEs (red), critical CVEs to watch (orange), and news mentions (yellow). Prioritize patching vendors with the largest red segment.

Plex 2 Eg Secure Solutions 1 Siemens 1 Fortinet 1 Atlassian 1 KEVs CVEs Mentions

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