Microsoft patched roughly 200 vulnerabilities on Tuesday 9 June, including six zero-days, and finally shipped the overdue Exchange fix 16 days after its federal deadline1. Those six zero-days were each under active attack before the patch landed. The month reverses May's quieter 120-CVE run, which carried no exploited zero-days at all and broke a 22-month streak.
Two fixes stand out for the Windows estate. A Kerberos KDC (Key Distribution Centre, the service that issues domain logon tickets) RCE reaches domain authentication, the layer that, once broken, hands an attacker the whole network. And two separate BitLocker disk-encryption bypasses shipped in a single cycle, a pairing that gives an attacker both access to the data and a route to escalate. An actively-exploited Defender privilege flaw, tracked as RoguePlanet at CVSS 9.6, grants SYSTEM-level control2.
The Exchange resolution closes the cleanest worked example of the patch-gap problem: CVE-2026-42897 sat on the KEV catalogue from 15 May, exploited, with only a stop-gap mitigation and no full fix until now. For administrators who ran the Emergency Mitigation Service workaround in the interim, the calendar mattered, because that mitigation broke OWA print and inline images while it held the line. The fix arrives, but the 16-day overrun is the data point a buyer should keep: even Microsoft, with the largest patch engineering operation in the industry, missed a federal deadline on an exploited flaw by more than two weeks.
