: A high-priority zero-day flaw that was actively exploited in the wild at the time of the patch release.
Security experts, including those from Rapid7 , have noted that the sheer volume of vulnerabilities being discovered—and subsequently patched—is an "accelerant" caused by AI. AI capabilities allow for faster identification of code errors and logic flaws, significantly shortening the window between a patch release and a "weaponized exploit". dass167 patched
: A Windows Defender privilege escalation bug. This vulnerability gained notoriety after its details were publicly leaked by a researcher following a delayed response from Microsoft. : A high-priority zero-day flaw that was actively
: Nearly 60 vulnerabilities were patched within the browser category alone, which may set a new record for a single release. The Impact of AI on Patch Cycles : A Windows Defender privilege escalation bug
While "167" is synonymous with the April 2026 Microsoft cycle, other manufacturers use similar designations for specific hardware fixes: