Threat Intelligence Report — June 23, 2026 | 5 New KEVs · 165 Victims

by

Report Date: 2026-06-23

New KEVs: 5  — unchanged vs last weekRansomware Victims: 165  ▼ -39 vs last week

5 vulnerabilities were added to the CISA Known Exploited Vulnerabilities catalog this period. Ubiquiti products show the strongest concentration of risk signals this week. Ransomware activity is moderate with 165 new victims posted to leak sites over the last 7 days, with Lockbit5 posting the most victims.

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-2026-20253 – Splunk Enterprise | CVSS 9.8 | EPSS 92.1% / 100th pct | PoC Available
    CISA deadline: 2026-06-21 (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.
  2. CVE-2026-34910 – Ubiquiti UniFi OS | CVSS 10.0 | EPSS 33.6% / 98th pct
    CISA deadline: 2026-06-26 (3d remaining) — 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-2026-34909 – Ubiquiti UniFi OS | CVSS 10.0 | EPSS 0.9% / 55th pct
    CISA deadline: 2026-06-26 (3d remaining) — 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.

New Today

  • CVE-2026-34910 – Ubiquiti UniFi OS | CVSS 10.0 (CRITICAL) | AV: Network | EPSS 33.6% / 98th pct | Ransomware Use: No
  • CVE-2026-34909 – Ubiquiti UniFi OS | CVSS 10.0 (CRITICAL) | AV: Network | EPSS 0.9% / 55th pct | Ransomware Use: No
  • CVE-2026-34908 – Ubiquiti UniFi OS | CVSS 10.0 (CRITICAL) | AV: Network | EPSS 0.9% / 54th pct | Ransomware Use: No
  • CVE-2025-67038 – Lantronix EDS5000 | CVSS 9.8 (CRITICAL) | AV: Network | EPSS 0.5% / 37th pct | Ransomware Use: No

Still Outstanding

  • CVE-2026-20253 – Splunk Enterprise | CVSS 9.8 (CRITICAL) | AV: Network | EPSS 92.1% / 100th pct | Ransomware Use: No | PoC Available

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.

18 new victims posted today
7-day total: 165 via Ransomware.live

Infostealer Exposure: 1,301 employee credentials and 14,440 user credentials compromised via infostealer malware across victim organisations — indicating credential theft likely preceded these ransomware deployments.

Most Active Groups

Lockbit5 33 Qilin 17 Thegentlemen 13 Icarus 10 Nova 9

Group Intelligence

  • Lockbit5 — LockBit 5.0 ("ChuongDong") emerged in September 2025 as the group's resurgence following the February 2024 law enforcement takedown, introducing cross-platform payloads targeting Windows, Linux, and VMware ESXi with enhanced evasion capabilities and continuing the RaaS affiliate model of its predecessors.
  • 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.
  • 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.
  • Nova — Nova (formerly RALord) is a ransomware-as-a-service (RaaS) group that encrypts victims’files and uses double-extortion tactics to pressure organizations into paying for decryption and data non-disclosure.

Most Targeted Sectors

Business Services 26 Manufacturing 18 Consumer Services 12 Agriculture And Food Production 11 Technology 11

Top Countries

US (33), DE (11), BR (8), CA (6), TH (5)

Notable Incidents

  • www.courdescomptes.sn (Public Sector · SN) — claimed by Krybit. La Cour des Comptes du Sénégal (The Court of Auditors of Senegal) is an independent supreme audit institution of Seneg… Press coverage →
  • Prince George County (Public Sector · US) — claimed by Ransomhouse. Prince George County is a local government entity focused on providing essential services and fostering community development. It offers a range of services including public safety, waste management, parks and recreation… Press coverage →
  • Central Bank of Libya (Financial Services · LY) — claimed by Qilin. N/A Press coverage →
  • Reynella East College (Not Found · AU) — claimed by Interlock. Reynella East College is an innovative educational institution offering a comprehensive curriculum for students from preschool to 12th grade. However, the school failed to adequately protect the privacy of its students a… Press coverage →
  • Commune d'Eyguires (Public Sector · FR) — claimed by Qilin. N/A Press coverage →

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.

Ubiquiti 3 Splunk 1 Lantronix 1 KEVs CVEs Mentions

Stay Ahead

Found this useful? Get the daily report in your reader.

Free. No account. No email. Follow in Feedly, Inoreader, or any RSS reader.