CVE-2021-28478

HIGH

Microsoft SharePoint Server - Authentication Bypass by Spoofing

Title source: llm

Microsoft SharePoint Server Spoofing Vulnerability

Core 1

Core References

Patch, Vendor Advisory x_refsource_misc

CVSS v3 7.6

EPSS 0.0157

EPSS Percentile 72.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

CWE

CWE-290

Status published

Products (3)

microsoft/sharepoint_foundation 2013 sp1

microsoft/sharepoint_server 2016

microsoft/sharepoint_server 2019

Published May 11, 2021

Tracked Since Feb 18, 2026