CVE-2026-21509

Sednit Group Resurfaces with SlimAgent Keylogger in Ukraine

Cyberattacks Target Ukraine and EU via Microsoft Office Vulnerability

Emergency Patch Released for Microsoft Office Due to Exploited Vulnerability

UK Cyberattacks Surge, Microsoft Office Vulnerability Discovered

Fortinet Confirms Exploitation of FortiCloud SSO Bypass Vulnerability

Microsoft Office Zero-Day Vulnerability Exploited

Fancy Bear Exploits Microsoft Zero-Day Vulnerability CVE-2026-21509

PackageGate Vulnerabilities Affect Major JavaScript Package Managers

Multiple Vulnerabilities Exploited in Cybersecurity Threats

Pawn Storm Campaign Deploys PRISMA, Targets Government and Critical Infrastructure Entities

Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities

Sednit reloaded: Back in the trenches

Operation MacroMaze: APT28 Exploits Microsoft Office Macros and Webhook[.]site for Spear ...

Fancy Bear Hackers Exploiting Microsoft Zero

Hackers Exploit Zero-Day Vulnerability in Microsoft Office for Attacks

Microsoft Office bugs exploited by Russia-linked APT28

Russian hackers are exploiting recently patched Microsoft Office vulnerability (CVE-2026-21509)

APT28 Uses Microsoft Office CVE-2026-21509 in Espionage

Russian hackers exploit recently patched Microsoft Office bug in attacks

Operation Neusploit: APT28 Uses CVE-2026-21509 | ThreatLabz - Zscaler, Inc.

UAC-0001 (APT28) Attack Detection: russia-Backed Actor Actively Exploits CVE

CERT

CERT

New Microsoft Office Vulnerability Sparks Cyberattacks on Ukraine and EU Institutions

Russian APT28 Exploit Zero

Cyber alerts

CVE-2025-15467: OpenSSL Vulnerability Leads to Denial-of-Service, Remote Code Execution

CVE-2026-24858: FortiOS SSO Zero-Day Exploited in the Wild

High Severity Vulnerability in Microsoft Office

Microsoft Office 0-day vulnerability CVE-2026-21509; Emergency updates available

Microsoft reveals actively exploited Office zero-day, provides emergency fix (CVE-2026-21509)

Emergency Patch Issued for Microsoft Office, 365 Over Hacking Threat