Will CVE-2026-45659 (SharePoint deserialization) lead to documented breach by 2026 end?

CISA added CVE-2026-45659 (Microsoft SharePoint Server Deserialization of Untrusted Data RCE) to its KEV Catalog on July 4, 2026, confirming active exploitation in the wild (per CISA Alerts). This vulnerability affects a critical enterprise product with high exposure.

Resolution Criteria

Public disclosure of at least one confirmed breach, intrusion, or data exfiltration attributed to exploitation of CVE-2026-45659, documented in CISA advisories, vendor statements, security researcher reports, or credible press sources.