By Frank Ziemann
Publication Date: 2026-05-22 15:08:00
Summary created by Smart Answers AI
In summary:
- PCWorld reports that Microsoft faces multiple critical security breaches, including an actively exploited Exchange Server spoofing vulnerability and a BitLocker bypass exploit called YellowKey.
- The vulnerabilities affect core Microsoft products like Defender, Edge, and Authenticator apps, with attackers gaining unauthorized system access and bypassing security protections.
- While Microsoft has patched some issues and reversed Edge’s plaintext password storage, the Exchange Server flaw remains unpatched, requiring immediate organizational mitigation efforts.
While there weren’t any genuine zero-day vulnerabilities to patch in May’s Patch Tuesday update, the fallout since then has been severe.
The first attacks on Microsoft Exchange Server occurred as early as Patch Tuesday week, abusing a vulnerability that still hasn’t been fixed and continues to be exploited by hackers.
Meanwhile, Microsoft has released security updates…
