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On July 2, 2026, CISA added CVE-2026-45659, a SharePoint Server RCE, to its Known Exploited Vulnerabilities catalog with a two-day patch deadline. Storm-2603 is using it to stage Warlock ransomware, living off the land the whole way. Here is why it matters, plus a free 12-rule Sigma pack to hunt it.

Threat Hunter 6 Jul 2026, 12:00 p.m. Actively exploited CVE-2026-45659 CISA CVE Patch Ransomware Remote Code Execution Vulnerability Warning