CVE-2026-45648: Windows Active Directory Domain Services Remote Code Execution Vulnerability

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-09 · updated 2026-09-24
Weakness: CWE-121

Description

Stack-based buffer overflow in Active Directory Domain Services allows an authorized attacker to execute code over a network.

Affected products

Microsoft Windows Server 2022: before 10.0.20348.5256 — fixed in 10.0.20348.5256
Microsoft Windows Server 2025: before 10.0.26100.32995 — fixed in 10.0.26100.32995
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.5256 — fixed in 10.0.20348.5256
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.32995 — fixed in 10.0.26100.32995

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2022 10.0.20348.5256; Microsoft Windows Server 2025 10.0.26100.32995; Microsoft Windows Server 2022 10.0.20348.5256; Microsoft Windows Server 2025 10.0.26100.32995. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45648

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