CVE-2026-55040

No fix known ExploitedEPSS 70%CVSS 9.1

Weak authentication in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over a network.

Published 2026-07-14 · In CISA KEV since 2026-08-18 · CVE record · OSV

Products: Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition