CVE-2018-8340 json
A security feature bypass vulnerability exists when Active Directory Federation Services (AD FS) improperly handles multi-factor authentica…
published 2018-08-15 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-19991
- cvss
- 6.5
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 7.9%
- EPSS 7.9% chance of exploitation in 30 days, percentile 94%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Exploit prediction
7.89% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 6.5 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:P/I:N/A:N |
Affected products
- Microsoft Windows Server 2016
- Microsoft Windows Server 2012 R2
- Microsoft Windows 10 Servers
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2018-8340
patch, vendor-advisory
-
securitytracker.com
/id/1041474
vdb-entry, third-party-advisory
-
securityfocus.com
/bid/105029
vdb-entry, third-party-advisory
Sources
- CVE List CVE-2018-8340
- NVD CVE-2018-8340
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.