Inadequate Encryption Strength in Microsoft Windows and Windows Server - CVE-2026-65777

Vulnerability details

The vulnerability allows a remote user to bypass a security feature.

The vulnerability exists due to inadequate encryption strength in Windows Active Directory when validating cryptographic keys over a network. A remote user can use a weak key to bypass a cryptographic key validation policy to bypass a security feature.

Successful exploitation requires high attack complexity and depends on specific environmental and system configuration conditions.

Affected software

How to mitigate CVE-2026-65777

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-65777
• https://support.microsoft.com/help/5120242

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Windows