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Microsoft patches LegacyHive Windows zero-day vulnerability
August 13, 2026 · BleepingComputer · Severity: CRITICAL
Microsoft released security patches for a Windows zero-day vulnerability named LegacyHive, which was disclosed after the July 2026 Patch Tuesday cycle. The flaw was actively exploited in the wild, prompting an urgent out-of-band update to protect affected systems.
Key Takeaways
- Microsoft patched the LegacyHive Windows zero-day disclosed after July 2026 Patch Tuesday.
- The vulnerability required urgent out-of-band patching due to active exploitation.
- Organizations should prioritize applying the security update to all affected Windows systems.