CVE-2018-8340

Severity: medium (CVSS 6.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 7.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-08-15 · updated 2026-06-17

Description

A security feature bypass vulnerability exists when Active Directory Federation Services (AD FS) improperly handles multi-factor authentication requests, aka "AD FS Security Feature Bypass Vulnerability." This affects Windows Server 2016, Windows Server 2012 R2, Windows 10 Servers.

Affected products

Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: 1709, 1803
Microsoft Windows 10 Servers: version 1709 (Server Core Installation), version 1803 (Server Core Installation)
Microsoft Windows Server 2012 R2: (Server Core installation)
Microsoft Windows Server 2016: (Server Core installation)

References

http://www.securityfocus.com/bid/105029
http://www.securitytracker.com/id/1041474
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8340
http://www.securityfocus.com/bid/105029
http://www.securitytracker.com/id/1041474
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8340

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