CVE-2026-55040
CRITICALMicrosoft SharePoint Server Security Feature Bypass Vulnerability
Title source: cnaDescription
Weak authentication in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over a network.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
patch
Microsoft SharePoint Server Security Feature Bypass Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55040
Scores
CVSS v3
9.1
EPSS
0.0163
EPSS Percentile
73.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
total
Details
CWE
CWE-1390
Status
published
Products (6)
Microsoft/Microsoft SharePoint Enterprise Server 2016
16.0.0 - 16.0.5561.1001
Microsoft/Microsoft SharePoint Server 2019
16.0.0 - 16.0.10417.20175
Microsoft/Microsoft SharePoint Server Subscription Edition
16.0.0 - 16.0.19725.20434
microsoft/sharepoint_server
2016
microsoft/sharepoint_server
2019
microsoft/sharepoint_server
< 16.0.19725.20434
Published
Jul 14, 2026
Tracked Since
Jul 14, 2026