Threat Feed
Daily intelligence on vulnerabilities, threat actors and geopolitical context — distilled from primary sources.
satellite_altDaily BriefCyber Threat Daily Brief — October 28, 2026
Today's briefing: 9 critical and 29 high-severity threats. A total of 45 detailed analyses covering vulnerabilities, threat actors, and geopolitical context.
Latest Reports
28 / 1823 results
criticalbug_reportVulnerabilityFortiMail vulnerability under active exploitation, immediate patching required
Fortinet FortiMail email security appliances. Specific affected versions not disclosed in available information. CVE identifier not yet assigned or not publicly disclosed.
highperson_alertThreat ActorMicrosoft X Account Hijacked in Cryptocurrency Pump-and-Dump Scheme
The threat actors behind this incident remain unidentified. Their motivation appears to be financial gain through a cryptocurrency pump-and-dump scheme, leveraging the compromise of Microsoft's official X (formerly Twitter) account with over 13 milli…
criticalbug_reportVulnerabilityFortinet FortiMail zero-day CVE-2026-104286 exploited for file writes
Fortinet FortiMail versions 7.2.0-7.2.9, 7.4.0-7.4.8, 7.6.0-7.6.6, and 8.0.0-8.0.1. Unauthenticated remote attackers can write arbitrary files via path traversal and null byte injection flaws in HTTP/HTTPS handlers.
criticalbug_reportVulnerabilityFortinet FortiMail critical RCE (CVE-2026-104286) exploited in the wild
Fortinet FortiMail appliances. Specific affected versions not disclosed in available information. Vulnerability enables remote code execution or command execution on vulnerable devices.
criticalbug_reportVulnerabilityCitrix NetScaler zero-day exploited in Finland before patches released
Citrix NetScaler ADC and Gateway versions 13.1 and 14.1 (including FIPS and NDcPP variants) released before September 27, 2026 patches. Internet-facing instances at highest risk.
highperson_alertThreat ActorSpanish Police Arrest 16-Year-Old Administrator of KillSec Ransomware Group
KillSec is a ransomware-as-a-service (RaaS) operation attributed to a Spain-based 16-year-old suspected administrator and a distributed network of operators across Europe.
criticalbug_reportVulnerabilityCitrix NetScaler ADC/Gateway under active attack in Finland
Citrix NetScaler ADC and NetScaler Gateway (all unpatched versions). Eight CVEs (CVE-2026-88771 through CVE-2026-88778) with CVSS 4.0 scores 7.0–9.5 (High to Critical).
highperson_alertThreat ActorKillSec Ransomware Gang Dismantled in Operation KillSwitch
KillSec is a ransomware and data extortion gang active since approximately 2024. The group is allegedly led by a 16-year-old administrator, with other key members including an 18-year-old developer (who was a minor during some alleged crimes), a nego…
highpublicGeopoliticalGovernment sector cyber threats surge to 27% in Microsoft 2026 report
Microsoft's 2026 Digital Defense Report reveals a substantial escalation in cyber threat activity targeting government agencies, which now represent 27% of observed incidents—a 59% relative increase from 17% in 2025.
criticalbug_reportVulnerabilityKiteworks patches critical code injection flaw in Email Protection Gateway
Kiteworks Email Protection Gateway (EPG) all versions before 9.4.1. EPG is part of the Kiteworks Private Content Network used by thousands of global corporations and government agencies with over 100 million end-users.
criticalbug_reportVulnerabilityCisco Catalyst SD-WAN Manager auth bypass under active exploitation
Cisco Catalyst SD-WAN Manager (specific versions not disclosed in source). Vulnerability allows unauthenticated remote attackers to gain administrative API access.
highperson_alertThreat ActorOpenAI disrupts distillation campaign tied to Moonshot AI associates
Individuals associated with Moonshot AI, a Chinese AI company based in Beijing, are attributed to this coordinated adversarial distillation campaign. The operators sought to illicitly extract protected reasoning from OpenAI's AI models through system…
criticalbug_reportVulnerabilityCisco Catalyst SD-WAN Manager auth bypass exploited in the wild
Cisco Catalyst SD-WAN Manager, all vulnerable versions prior to patched releases. The vulnerability (CVE-2026-76504) affects the API authentication mechanism due to improper URI encoding handling in HTTP requests.
criticalpublicGeopoliticalPentagon DMDC breach exposes 3M military personnel records
The breach of the Defense Manpower Data Center represents a significant compromise of U.S. military human capital data, affecting nearly 3 million service members over a nine-month period from October 2025 to July 2026.
criticalbug_reportVulnerabilityWatchGuard Fireware OS critical RCE flaw requires immediate patching
WatchGuard Fireware OS - specific versions not disclosed in available data. Affects WatchGuard firewall appliances running vulnerable Fireware OS versions.
highbug_reportVulnerabilityApple CoreGraphics CVE-2026-86950 PoC published; in-the-wild use reported
Apple CoreGraphics on iOS versions before iOS 27 and macOS Golden Gate 27. Vulnerability triggered via malicious PDF with crafted embedded TrueType font.
criticalbug_reportVulnerabilityBitget confirms zero-day in third-party security product led to $387M theft
Bitget cryptocurrency exchange; third-party security products (Product A and Product B, vendors unnamed); 11 blockchains including Ethereum, XRP Ledger, Zcash, TRON, Arbitrum, Optimism, Base, BNB Smart Chain, Avalanche, Algorand, and Celestia.
highperson_alertThreat ActorStar Blizzard deploys CosmicPulse backdoor via new RedFlick technique
Star Blizzard (also tracked as SEABORGIUM, Callisto Group, TA446, COLDRIVER) is a Russian state-sponsored threat actor active since 2017. The group is attributed to Russian intelligence services and is motivated by espionage objectives aligned with R…
highbug_reportVulnerabilityZammad zero-days CVE-2026-102489/102490 exploited in AI-driven breach
Zammad open-source ticketing system, all versions prior to version 7. Both self-hosted and hosted deployments affected. Over 2,000 customers and 55,000 users globally, including enterprise and nonprofit organizations.
highbug_reportVulnerabilityZimbra CVE-2026-73570 exploited to deploy web shells, steal credentials
Zimbra Collaboration Suite (ZCS) versions prior to 10.1.20. Exploitation requires SNMP notifications enabled and the optional zimbra-snmp package installed. Unauthenticated remote code execution via crafted SMTP requests.
highbug_reportVulnerabilityPhishing campaign abuses legitimate MSP360 RMM to deploy ScreenConnect
Organizations using Windows endpoints. Attackers distribute legitimate MSP360 RMM v2.5.0.67 installer via phishing emails with deceptive filenames (meeting invites, PDF readers, Zoom installers). ScreenConnect deployed as secondary RMM.
criticalbug_reportVulnerabilityCritical pre-auth RCE in MikroTik RouterOS (CVE-2026-84411)
MikroTik RouterOS versions below 7.24. Vulnerability exists in web management service HTTP request handling. Widely deployed in critical infrastructure and enterprise networks.
criticalbug_reportVulnerabilityCisco SD-WAN Manager zero-day exploited: auth bypass grants admin API access
Cisco Catalyst SD-WAN Manager, all configurations. Affected versions: all releases prior to 20.9.10.1, 20.12.8.2, 20.15.6.1, 20.18.4.1, 26.1.2.1, and 26.2.1. Releases earlier than 20.9 require migration.
highperson_alertThreat ActorUnidentified Actors Abuse ChatGPT Custom GPTs to Deliver RAT via ClickFix
The threat actors behind this campaign remain unidentified. Their motivation appears to be financially driven, leveraging trusted AI platforms (ChatGPT Custom GPTs) to conduct social engineering attacks that deliver remote access trojans.
criticalbug_reportVulnerabilityCisco Catalyst SD-WAN Manager zero-day exploited for admin escalation
Cisco Catalyst SD-WAN Manager (formerly SD-WAN vManage): all versions prior to 20.9.10.1, 20.12.8.2, 20.15.6.1, 20.18.4.1, 26.1.2.1, and 26.2.1. All deployments affected regardless of configuration.
highbug_reportVulnerabilityZimbra CVE-2026-73570: Unauthenticated RCE exploited in the wild
Zimbra Collaboration Suite versions prior to 10.1.20, when the optional zimbra-snmp package is installed and SNMP notifications are enabled. Internet-facing mail servers are at risk. Exploitation requires no authentication or user interaction.
highbug_reportVulnerabilityTeamViewer patches RCE and privilege escalation flaws in client software
TeamViewer Full Client and Host software for Windows, Linux, and macOS. Vulnerabilities resolved in version 15.82 and supported maintenance/legacy releases.
criticalbug_reportVulnerabilityBitget crypto exchange breached via zero-day in security appliances
Bitget cryptocurrency exchange. Two unnamed third-party security appliances (referred to as "Product A" and "security appliance B") compromised via zero-day vulnerabilities.