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Fencer Intel
high 8.0

CVE-2026-33826 json

Windows Active Directory Remote Code Execution Vulnerability

published 6mo ago modified 25d ago also EUVD-2026-22645

cvss
8.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.

Patch / fix

  • Microsoft Windows Server 2012 R2 6.3.9600.23132
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.23132
  • Microsoft Windows Server 2016 10.0.14393.9060
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.9060
  • Microsoft Windows Server 2019 10.0.17763.8644
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.8644
  • Microsoft Windows Server 2022 10.0.20348.5020
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2274
  • Microsoft Windows Server 2025 10.0.26100.32690
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.32690

Is CVE-2026-33826 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
7mo ago

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 8.0 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 8.0 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • 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 2022, 23H2 Edition (Server Core installation)
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

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.