CVE-2026-83674CWE-1390

CVE-2026-83674

High · published October 13, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
50.2
In the wild
Unconfirmed
What it is

Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00643 · 50.2th percentile
Weakness
CWE-1390 · Weak Authentication
Published
2026-10-13T23:20Z
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83674 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:34Z
    EPSS moved — → 1%
    epss
  • 13 OCT 19:00Z
    Active Directory Federation Services (AD FS) Spoofing Vulnerability
    cvelistv5
  • 13 OCT 19:00Z
    Active Directory Federation Services (AD FS) Spoofing Vulnerability
    cvelistv5