AL26-023 - Vulnerability Impacting Microsoft SharePoint Server - CVE-2026-65660
Canada’s Cyber Centre says SharePoint flaw CVE-2026-65660 is actively exploited for code execution.
Canada’s Cyber Centre says SharePoint flaw CVE-2026-65660 is actively exploited for code execution.
CVE-2026-65660 allows authenticated low-privilege users to execute arbitrary code on vulnerable on-premises Microsoft SharePoint servers via a SafeControls bypass.
Microsoft patched CVE-2026-50522 (CVSS 9.8), an unauthenticated deserialization RCE in on-premises SharePoint servers, in its July 2026 updates; no exploitation confirmed at disclosure.
CVE-2026-50522 is an unauthenticated .NET deserialization RCE in SharePoint Server Subscription, 2019, and 2016; Microsoft patched it July 14, 2026.
Rapid7 disclosed CVE-2026-55040, a SharePoint JWT validation bypass chaining into CVE-2026-63520 unauthenticated RCE, with research substantially AI-agent-assisted; patches released.
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