Microsoft Exchange Zero-Day Hack Confirmed—3 Vulnerabilities Exploited

Microsoft Exchange Zero-Day Hack Confirmed—3 Vulnerabilities Exploited

By Davey Winder
Publication Date: 2026-05-16 11:32:00

Hot on the heels of three new zero-day exploits against Windows 11, confirmed on May 14, Microsoft was hacked again just 24 hours later, as a three-vulnerability chained Exchange zero-day exploit was demonstrated at the Pwn2Own elite hacking event in Berlin. Here’s what you need to know.

ForbesMicrosoft Windows 11 Exploited 3 Times In 24 Hours By Zero-Day Hackers

Microsoft Exchange Falls To Zero-Day Hack At Pwn2Own Berlin

Pwn2Own is a twice-yearly event organized by the Trend Micro Zero Day Initiative, where some of the world’s most elite ethical hackers compete against each other, and the clock, to exploit previously unknown vulnerabilities in both software and hardware. The Berlin event got off to a flying start on May 14 as Windows 11 was hit by no less than three zero-day exploits. On day two, hacking teams were no less successful, chaining together three new vulnerabilities in Microsoft…