SB2025040882 - Multiple vulnerabilities in Microsoft Windows Kerberos

Description

This security bulletin contains information about 2 vulnerabilities.

1) Insecure Storage of Sensitive Information (CVE-ID: CVE-2025-29809)

CWE-ID: CWE-922 - Insecure Storage of Sensitive Information

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

The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to insecure storage of sensitive information in Windows Kerberos. A local user can bypass the security feature on the system.

2) Input validation error (CVE-ID: CVE-2025-26647)

CWE-ID: CWE-20 - Improper input validation

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

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to insufficient validation of user-supplied input in Windows Kerberos. A remote attacker can perform a man-in-the-middle (MitM) attack and gain elevated privileges on the system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-29809
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26647