Back to vendor advisories
Microsoft Security Response CenterCVE-2026-55040

Microsoft SharePoint Server Security Feature Bypass Vulnerability

CriticalVendor CVSS 9.1 / 10 1 CVE Published Jul 14, 2026 at 7:00 AM UTC

Summary

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

Products covered

  • Microsoft SharePoint Enterprise Server 2016

  • Microsoft SharePoint Server 2019

  • Microsoft SharePoint Server Subscription Edition

Remediation

Install KB5002891. Install KB5002883. Install KB5002882.

Vendor-listed fixes

  • 16.0.5561.1001

  • 16.0.10417.20175

  • 16.0.19725.20434

CVEs in this advisory 1

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.