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Fencer Vulns
medium 5.9

CVE-2026-50324 json

Windows Active Directory Federation Services Denial of Service Vulnerability

published 2026-07-14 3 mo ago modified 2026-11-01 7 d ago also EUVD-2026-43887

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

Patch / fix

  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
  • Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.4143.0
  • Microsoft Microsoft .NET Framework 4.8 4.8.4803.0
  • Microsoft Microsoft .NET Framework 4.8.1 4.8.9340.0
  • Microsoft Windows 10 Version 1607 10.0.14393.9339
  • Microsoft Windows 10 Version 1809 10.0.17763.9020
  • Microsoft Windows Server 2012 R2 6.3.9600.23291
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.23291
  • Microsoft Windows Server 2016 10.0.14393.9339
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.9339
  • Microsoft Windows Server 2019 10.0.17763.9020
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.9020
  • Microsoft Windows Server 2022 10.0.20348.5386
  • Microsoft Windows Server 2025 10.0.26100.33158
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.33158

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.85% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8.1
  • Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2
  • Microsoft Microsoft .NET Framework 4.8
  • Microsoft Microsoft .NET Framework 4.8.1
  • Microsoft Windows 10 Version 1607
  • Microsoft Windows 10 Version 1809
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2012 R2 (Server Core installation)
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows Server 2022
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns 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.