CVE-2026-44810: Microsoft Cryptographic Services Elevation of Privilege Vulnerability

Synopsis

An improper authentication vulnerability in Windows Cryptographic Services allows a local attacker to elevate privileges without any credentials. The attacker needs only an existing foothold on the host; no network access or user interaction is required, as derived from the CVSS vector (AV:L/PR:N/UI:N). Successful exploitation gives the attacker full control over confidentiality, integrity, and availability on the affected system. Patched-image rebuilds at the fix versions are available on HarborGuard for environments running an affected Windows build.

HarborGuard Coverage

Exploit Conditions

• Network reachabilityNot required

  The attacker needs an existing shell or process on the host; no network-facing exposure is required.

• AuthenticationNot required

  No credentials or account are required to trigger the vulnerability; the attacker needs only code execution on the host.

• Victim interactionNot required

  No user action such as clicking a link or opening a file is needed for exploitation.

• Attack complexityDetail

  Attack complexity is low, meaning the exploit is reliable and does not depend on race conditions or specific environmental configuration.

Blast Radius

• A successful attacker reads sensitive cryptographic material, private keys, and protected system data on the host.
• The attacker modifies cryptographic service state and persisted system configurations.
• The attacker can crash or disable Windows Cryptographic Services, disrupting all operations that depend on it such as TLS, code signing, and certificate validation.
• Because all three impact dimensions (C, I, A) are rated HIGH, the attacker effectively achieves full control over the compromised host's security subsystem.