Report Date: 2026-10-07
New KEVs: 4Ransomware Victims: 221
4 vulnerabilities were added to the CISA Known Exploited Vulnerabilities catalog this period. Zammad Gmbh products show the strongest concentration of risk signals this week. Ransomware activity is moderate with 221 new victims posted to leak sites over the last 7 days, with Thegentlemen 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.
- CVE-2026-104286 – Fortinet FortiMail | CVSS 9.8 | EPSS 2.2% / 82th pct
CISA deadline: 2026-10-04 (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. - CVE-2026-102490 – Zammad GmbH Zammad | CVSS 9.4 | EPSS 0.6% / 48th pct
CISA deadline: 2026-10-05 (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. - CVE-2026-102489 – Zammad GmbH Zammad | CVSS 9.4 | EPSS 1.4% / 72th pct
CISA deadline: 2026-10-05 (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-2026-104286 – Fortinet FortiMail | CVSS 9.8 (CRITICAL) | AV: Network | EPSS 2.2% / 82th pct | Ransomware Use: No
- CVE-2026-102490 – Zammad GmbH Zammad | CVSS 9.4 (CRITICAL) | AV: Network | EPSS 0.6% / 48th pct | Ransomware Use: No
- CVE-2026-102489 – Zammad GmbH Zammad | CVSS 9.4 (CRITICAL) | AV: Network | EPSS 1.4% / 72th pct | Ransomware Use: No
- CVE-2026-88779 – Citrix NetScaler | CVSS 8.7 (HIGH) | AV: Network | EPSS 0.6% / 46th 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.
- CISA ICS AdvisoryAdvisory · yesterday – Hitachi Energy RTU500
View CSAF Summary Hitachi Energy is publishing this cybersecurity advisory in response to the security findings reported by Dragos affecting end-of-life RTU500 CMU firmware version 9.x. The reported findings are associat… - CISA ICS AdvisoryAdvisory · yesterday – Hitachi Energy REB500
View CSAF Summary Hitachi Energy is aware of open-source software vulnerabilities that affect REB500 product versions listed in this document. These vulnerabilities can be exploited to carry out Denial of Service (DoS) a… - CISA ICS AdvisoryAdvisory · yesterday – Hitachi Energy SOI
View CSAF Summary Hitachi Energy is aware of RCE (Remote Code Execution) vulnerability in Apache ActiveMQ component of SOI product versions listed in this document. These vulnerabilities can be exploited to carry out var… - SANS ISCResearch · yesterday – More RMM Tools In the Wild, (Tue, Oct 6th)
It seems that a trend started… I continue my journey discovering more RMM ("Remote Management & Monitoring") tools abused by threat actors! A few days ago, I wrote a diary[1… - SANS ISCResearch · 6 days ago – ScreenConnect Client (Ab)used by Attackers, (Thu, Oct 1st)
Threat Actors do not always use top-notch techniques or very complex malware to perform their attacks. Sometimes, they just abuse of existing applications…
 - Unit 42Incident · yesterday – Blinder Tunnel Campaign Targets Iraqi Infrastructure
Analysis of Blinder Tunnel, an Iran-nexus campaign using fake Dubai Airports recruitment lures and GitHub C2 malware to target critical infrastructure. The post Blinder Tunnel Campaign Targets Iraqi Infrastructure appear… - Unit 42Research · 7 days ago – Threat Brief: NetScaler Zero Days CVE-2026-88771 and CVE-2026-88772 Exploited in the Wild (Updated September 30)
Unit 42 is aware of possible 0-day activity against NetScaler devices. Citrix reports CVE-2026-88771, CVE-2026-88772 have been exploited in the wild. The post Threat Brief: NetScaler Zero Days CVE-2026-88771 and CVE-2026… - Sophos X-OpsResearch · 2 days ago – Citrix NetScaler vulnerability (CVE-2026-88779) in active exploitation
Categories: Threat Research Tags: advisory, vulnerability, Citrix - Sophos X-OpsResearch · 7 days ago – TerminalFix and Lorem Ipsum Loader enable covert tunneling
The activity is linked to a broader campaign that previously used a different delivery mechanism Categories: Threat Research Tags: TerminalFix, clickfix, Lorem Ipsum Loader - The RecordNews · yesterday – Alleged ATM malware creator appears in Nebraska court after arrest
Aguirre was added to the FBIâs âTop 10 Most Wanted Fugitivesâ list in March, becoming the first cybercriminal added to the list. - The RecordIncident · yesterday – South Korean officials believe AI agents were used to hack several banks
The personal data of at least 68,000 people was reportedly exposed in breaches of at least seven financial institutions, with officials saying they believe a Chinese cybersecurity tool was used to hack the banksâ syste… - Security Affairs (APT)Incident · 3 days ago – Warlock Ransomware Still Exploits Year-Old SharePoint Flaws to Hit Critical Infrastructure
Warlock ransomware continues to exploit unpatched SharePoint flaws to breach water utilities, telecoms, governments, and universities worldwide. Warlock ransomware made headlines back in mid-2025 for exploiting a chain o… - Security Affairs (APT)Incident · 4 days ago – Antino Backdoor Lets China-Linked UAT-11587 Turn Microsoft 365 Into a C2 Channel
Cisco Talos details UAT-11587, a China-linked group using the Antino backdoor and Microsoft 365 as cover to spy on Asian governments. Cisco Talos has been tracking a cluster of espionage activity since September 2025 tha… - Security Affairs (Cybercrime)Incident · yesterday – FBI Drops Accenture Contractor After Sensitive Data Breach
Accenture lost an FBI contract after a missed security patch exposed sensitive employee data, raising serious concerns over operational security. The FBI pulled an Accenture contractor off its account on Monday, and the … - Security Affairs (Cybercrime)Incident · 2 days ago – Denmark ’s Population Registry Breached, 8.8 Million Affected
Hackers accessed names, addresses and CPR numbers of 8.8 million people in Denmark through a third-party company with legal registry access. A hacker broke into the database that holds basically every identifying detail …
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.
15 new victims posted today
7-day total: 221 via Ransomware.live
Most Active Groups
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.
- Lamashtu — Lamashtu is an extortion group that first appeared in April 2026, claiming attacks against organizations in France, Romania, and Thailand across energy, pharmaceutical, and film sectors; it has not yet been confirmed as operating actual file-encrypting ransomware rather than pure data-theft extortion.
- Safepay — SafePay emerged in September 2024 as a rapidly growing ransomware operation that explicitly disavows the RaaS model and manages all operations internally, claiming over 300 victims worldwide by mid-2025 with a high-profile early attack against UK telematics firm Microlise stealing 1.2 TB of data.
Most Targeted Sectors
Top Countries
US (87), DE (13), GB (7), IT (6), FR (6)
Notable Incidents
- Slate Valley Unified School District (Education · US) — claimed by Kairos. The Slate Valley Unified Union School District is a public school district located in Fair Haven, Vermont, serving the communities of Benson, Castleton, Fair Haven, Hubbardton, Orwell, and West Haven. The data also inclu… Press coverage →
- parkdental.com (Healthcare · GB) — claimed by Chaos. To the Management of Park Dental:
Time is running out. Our previous attempts to establish a constructive dialogue regarding the security breach have been met with silence.
If the management of Park Dental fails to get …
Press coverage → - Trump Mobile Wireless (Telecom) (Technology · US) — claimed by Byod. Trump mobile was informed they had been breached, they then replied with "We have no team to handle this" and that anyone who hacks them are a terrorist. Well unfortunately for them, all 3615 customers and their PII, alo… Press coverage →
- Forma Therapeutics Holdings, Inc. (Healthcare · US) — claimed by Nightspire. – Clinical Trial & Statistical Data- Electronic Lab Notebooks & Research IP- Drug Discovery & Pipeline Data- Biological Research & Genomic Data 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.
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