Microsoft's June 2026 security update addresses 206 vulnerabilities, including 32 critical flaws. The majority of these critical entries are remote code execution (RCE) vulnerabilities affecting core services such as Windows Active Directory, Hyper-V, and the HTTP Protocol Stack. Talos has identified several vulnerabilities where exploitation is considered more likely, specifically highlighting heap-based buffer overflows in the Remote Desktop Client and integer overflows in the Windows Graphics component.
In addition to the critical RCE flaws, the update covers elevation of privilege, information disclosure, and security feature bypass vulnerabilities across the Microsoft ecosystem, including Azure and Office. Organizations are encouraged to apply patches immediately and update their security rulesets. Cisco Talos has released specific Snort rules to detect exploitation attempts targeting these newly disclosed vulnerabilities.
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