GoKawiilAttackers chain two Microsoft SharePoint flaws using public PoC exploits
Threat intelligence firm Defused reports that hackers are actively probing SharePoint servers by combining two vulnerabilities: an authentication bypass in JWT token validation (CVE-2026-55040) and a Business Connectivity Services flaw (CVE-2026-63520) that enables remote code execution. Proof-of-concept code for both bugs was published publicly in August by researchers at Rapid7 and VulnCheck, and Defused says it has already observed the bypass being exploited alongside admin enumeration on honeypots, though no successful code execution has been confirmed yet.