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High severity · published Apr 14, 2026
CVE-2026-33826
Windows Active Directory Remote Code Execution Vulnerability
8.0
CVSS
0.5%
EPSS
No
On KEV
Description
Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WS
Windows Server 2012 R2 · Microsoft
6.3.9600.0 before 6.3.9600.23132 · source: vendor
WS
Windows Server 2012 R2 (Server Core installation) · Microsoft
6.3.9600.0 before 6.3.9600.23132 · source: vendor
WS
Windows Server 2016 · Microsoft
10.0.14393.0 before 10.0.14393.9060 · source: vendor, NVD
WS
Windows Server 2016 (Server Core installation) · Microsoft
10.0.14393.0 before 10.0.14393.9060 · source: vendor
WS
Windows Server 2019 · Microsoft
10.0.17763.0 before 10.0.17763.8644 · source: vendor, NVD
WS
Windows Server 2019 (Server Core installation) · Microsoft
10.0.17763.0 before 10.0.17763.8644 · source: vendor
WS
Windows Server 2022 · Microsoft
10.0.20348.0 before 10.0.20348.5020 · source: vendor, NVD
WS
Windows Server 2022, 23H2 Edition (Server Core installation) · Microsoft
10.0.25398.0 before 10.0.25398.2274 · source: vendor
WS
Windows Server 2025 · Microsoft
10.0.26100.0 before 10.0.26100.32690 · source: vendor, NVD
WS
Windows Server 2025 (Server Core installation) · Microsoft
10.0.26100.0 before 10.0.26100.32690 · source: vendor
WS
Windows Server 2012 · Microsoft
r2 · source: NVD
WS
Windows Server 2022 23h2 · Microsoft
before 10.0.25398.2274 · source: NVD
Affected product
WS
Windows Server 2012 R2
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33826
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33826
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33826
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