"Microsoft has addressed around 140 newly discovered common vulnerabilities and exposures (CVEs) in its May Patch Tuesday update, but for the first time in a long time, the latest monthly drop contains no zero-day flaws, meaning that none of the issues in scope have been actively exploited or publicly disclosed."
"Although the absence of zero-days is a positive sign, the high number of critical vulnerabilities - particularly compared to recent months - means organisations should still move quickly to evaluate and deploy updates across affected systems."
"The May 2026 update cycle is a high-stakes bridge to the 26 June certificate expiration deadline, making fleet-wide rotation to new trust anchors the month's absolute priority."
"For those who haven't patched for last month's releases for the Windows Shell and Microsoft Defender bypass flaws, it is imperative that security teams give these the highest priority,"
Microsoft’s May Patch Tuesday update addresses around 140 newly discovered CVEs. The update contains no zero-day flaws, with none of the in-scope issues actively exploited or publicly disclosed. Despite the absence of zero-days, the update includes almost 20 critical severity vulnerabilities that are likely to attract threat activity. Security teams are urged to evaluate and deploy updates quickly. The update cycle is also tied to a Secure Boot certificate expiration deadline on 26 June. Devices that do not receive updated Secure Boot certificates may experience catastrophic failures or security weaknesses that could be difficult to remediate. Priority is placed on rotating trust anchors fleet-wide and patching prior Windows Shell and Microsoft Defender bypass issues.
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