SB2025040903 - Multiple vulnerabilities in Microsoft Windows Hello

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper Authentication (CVE-ID: CVE-2025-26635)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to bypass authentication process.

The vulnerability exists due to an error when processing authentication requests in Windows Hello. A remote administrator can bypass the Windows Hello security feature.

2) Inadequate Detection or Handling of Adversarial Input Perturbations in Automated Recognition Mechanism (CVE-ID: CVE-2025-26644)

CWE-ID: CWE-1039 - Automated Recognition Mechanism with Inadequate Detection or Handling of Adversarial Input Perturbations

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local attacker to perform spoofing attack.

The vulnerability exists due to automated recognition mechanism with inadequate detection or handling of adversarial input perturbations in Windows Hello. A local attacker can spoof page content.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26635
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26644