Jul 2026: Microsoft SharePoint Server Security Feature Bypass Vulnerability
CVE-2026-55040 Published on July 14, 2026
Microsoft SharePoint Server Security Feature Bypass Vulnerability
Weak authentication in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over a network.
Known Exploited Vulnerability
This Microsoft SharePoint Weak Authentication Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Microsoft SharePoint contains a weak authentication vulnerability which allows an unauthorized attacker to bypass a security feature over a network.
The following remediation steps are recommended / required by August 21, 2026: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicab
Weakness Type
Products Associated with CVE-2026-55040
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Affected Versions
Microsoft SharePoint Enterprise Server 2016:- Version 16.0.0 and below 16.0.5561.1001 is affected.
- Version 16.0.0 and below 16.0.10417.20175 is affected.
- Version 16.0.0 and below 16.0.19725.20434 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.