Critical Analysis: CVE-2026-65660 - Microsoft SharePoint Code Injection Vulnerability... — September 30, 2026

Published 30 Sep 2026 · vulnerability management, CVE analysis, threat intelligence, security operations, cybersecurity news

CVE-2026-65660: Cracking Open SharePoint with Code Injection Alright team, let's talk about something significant that just dropped on September 30, 2026: CVE-2026-65660. This is a critical code injection vulnerability affecting Microsoft SharePoint Server, and from where I'm sitting, it's a nasty one. My colleagues and I at AGMP Partners have been digging into the details, and the implications for enterprise security are substantial. When a core collaboration platform like SharePoint, often housing an organization’s crown jewels, gets hit with a bug this severe, it demands immediate and thorough attention. Microsoft has released patches, but understanding the underlying mechanisms and potential impact is crucial for effective defense. Initial Discovery and Context This vulnerability, designated CVE-2026-65660, was discovered by independent researchers and reported to Microsoft. It impac