🚨 CRITICAL ALERT: MSHTML Zero-Day Actively Exploited in Microsoft Patch Tuesday Wave

The Tech: Microsoft’s February 2026 Patch Tuesday addressed a staggering 59 vulnerabilities, notably including six actively exploited zero-days. Among them is CVE-2026-21513, a critical protection mechanism failure in the MSHTML Framework (Trident engine). This flaw allows attackers to bypass security features, often serving as a gateway for broader system compromise. The high volume of zero-days signals aggressive exploitation campaigns.

The Real World View: Imagine a brand new security door on your house, but a subtle defect in its frame allows a skilled burglar to bypass the lock entirely, even before you realize the flaw exists. That's what an actively exploited zero-day in a core component like MSHTML represents – a critical, unforeseen entry point that’s already being used by adversaries.

Action: Prioritize the immediate deployment of Microsoft's February 2026 security updates, especially patches related to MSHTML, Windows Hyper-V, and any other components flagged in the Patch Tuesday bulletin. Verify patch success and monitor systems for post-exploitation activity, as these vulnerabilities are known to be under active attack.