Microsoft patches actively exploited Office zero-day vulnerability

Microsoft has released emergency security updates to patch a high-severity Office zero-day vulnerability exploited in attacks ...

Microsoft Issues Emergency Patch for Active Office Zero-Day

Microsoft released an emergency Office patch to fix an actively exploited zero-day flaw that lets attackers bypass security ...
SecurityWeek

Microsoft Patches Office Zero-Day Likely Exploited in Targeted Attacks

Microsoft released patches for CVE-2026-21509, a new Office zero-day vulnerability that can be exploited to bypass security features.
The Hacker News

Microsoft Office Zero-Day (CVE-2026-21509) - Emergency Patch Issued for Active Exploitation

Microsoft released out-of-band patches for an actively exploited Microsoft Office zero-day, CVE-2026-21509, a security ...
CSOonline

What are zero-day attacks and why do they work?

Zero-day attacks have become a significant concern in the realm of cybersecurity, posing a formidable challenge to individuals and organizations alike. These attacks exploit vulnerabilities that are ...

AI and Security: Zero-day exploits through AI are already a reality

AIs can create complex zero-day exploits. The consequence: The search for security vulnerabilities is successfully industrialized and scaled.
The Register on MSN

Office zero-day exploited in the wild forces Microsoft OOB patch

Another actively abused Office bug, another emergency patch – Office 2016 and 2019 users are left with registry tweaks ...

Fortinet blocks exploited FortiCloud SSO zero day until patch is ready

Fortinet has confirmed a new, actively exploited critical FortiCloud single sign-on (SSO) authentication bypass vulnerability ...
Infosecurity Magazine

Zero-Day Exploits Surge, Nearly 30% of Flaws Attacked Before Disclosure

VulnCheck analysts found that vulnerabilities exploited before being publicly disclosed rose from 23.6% in 2024 to 28.96% in 2025 ...