Microsoft Fixes Major Security Vulnerabilities

Microsoft has released its April 2026 security update, fixing more than 160 vulnerabilities across its software ecosystem. Among them is a critical zero day flaw in SharePoint Server, which has already been exploited in real world attacks. This vulnerability allows attackers to impersonate trusted entities, potentially gaining access to sensitive data and altering information.

Although the flaw has a moderate severity rating, experts consider it highly dangerous due to its active exploitation. It has also been added to the known exploited vulnerabilities list by the CISA, with urgent patching recommended. In addition to this, the update includes several other serious issues such as remote code execution and privilege escalation vulnerabilities.

Security experts have described this as one of the largest updates in recent times, affecting products like Windows, Office, Defender, and SharePoint. Organizations, especially those using internet facing servers, have been advised to apply patches immediately to prevent potential cyberattacks. The update highlights the growing scale and urgency of cybersecurity threats worldwide.