:

MICROSOFT PATCHES 120 FLAWS IN MAY 2026 UPDATE

SECURITY DESK1 MIN READ
TUE, MAY 12, 2026

■ AI-SUMMARIZED FROM 4 SOURCES ▸ TIMELINE

Microsoft released its May 2026 Patch Tuesday with fixes for 120 security vulnerabilities across its product lineup. No zero-day exploits were disclosed this month.

Microsoft deployed its monthly security update on May 2026 Patch Tuesday, addressing 120 flaws in various products and services. The update cycle included patches across Windows, Office, Exchange Server, and other enterprise software. None of the vulnerabilities patched this month were zero-days—flaws previously unknown to Microsoft or actively exploited in the wild. This represents a standard month for the company's security operations, without the elevated risk associated with unpatched exploits. The May update continues Microsoft's established practice of consolidating security fixes into a single monthly release. Organizations using Windows and Microsoft enterprise products should apply these patches according to their update schedules and risk assessment protocols. Patch Tuesday updates typically span multiple severity levels. Organizations are advised to prioritize critical and important-rated fixes based on their infrastructure composition and exposure to affected systems. Microsoft's monthly patching cycle has become standard across the industry, allowing IT teams to plan and test updates in advance rather than responding to emergency out-of-band releases. The absence of zero-days in May suggests the security landscape remained stable during the month prior to this release cycle. Administrators should review Microsoft's official security advisory documentation to identify which patches apply to their deployed systems. Testing in non-production environments before broad deployment remains recommended practice for enterprise environments.

■ SOURCES

Bleeping ComputerBleeping ComputerArs TechnicaKrebs on Security

■ SUMMARY WRITTEN BY AI FROM THE LINKS ABOVE

■ MORE FROM THE SECURITY DESK

Partnered Health, one of Australia's largest healthcare providers, has disclosed a cyber-attack affecting 21 clinics across Sydney, Melbourne, and Canberra. Personal information and medical records were compromised in the breach.

JUST NOWSecurity Desk

Security firm Intruder has developed an AI-powered system that automatically identifies previously unknown software vulnerabilities by combining code analysis with large language models. The tool already discovered and exploited a WordPress plugin zero-day.

JUST NOWAI Desk

U.S. federal prosecutors have unsealed charges against three Russian nationals accused of operating a bulletproof hosting service that supported ransomware gangs responsible for over $62 million in damages worldwide.

5H AGOIndustry Desk

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) warned that attackers are actively exploiting three vulnerabilities in Internet-exposed on-premises SharePoint Server instances. Organizations running affected versions must patch immediately.

5H AGOSecurity Desk

■ SUBSCRIBE TO THE DAILY BRIEF

ONE EMAIL, 5 STORIES, 06:00 UTC. UNSUBSCRIBE ANYTIME.