CVE-2026-55040

Microsoft SharePoint Weak Authentication Vulnerability
69.5%
EPSS
99%
Percentile
Yes
Known exploited
0
APAC news · 90d
Summary

Microsoft SharePoint contains a weak authentication vulnerability which allows an unauthorized attacker to bypass a security feature over a network.

Vendor
Microsoft
Product
SharePoint
Added to KEV
Aug 18, 2026
Remediation due
Aug 21, 2026 (US federal deadline)
Ransomware use
Not known
Weakness
CWE-1390
EPSS
69.5% as of Nov 12
In the news
  • No Asia-Pacific article names this CVE yet.
Linked
Actors named alongside it:
none
Incidents exploiting it:
  • none recorded