Microsoft ships largest Patch Tuesday on record, with one bug under active attack
ID: d8594759-340a-5809-8987-ac1003e24569
STIX ID: report--d8594759-340a-5809-8987-ac1003e24569
Feed Name: The Record from Recorded Future News
Threat Score
Microsoft released fixes for over 200 CVEs in June 2026, including a 9.8-rated wormable Windows kernel RCE (CVE-2026-45657), an actively exploited Microsoft Defender elevation-of-privilege (CVE-2026-41091) added to CISA's catalog, and other zero-days such as a BitLocker bypass; a researcher known as "Nightmare Eclipse" has been publishing exploit code and threatening further releases, making rapid patching urgent.
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