SB2025101467 - Multiple vulnerabilities in Microsoft Exchange Server

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Improper authentication (CVE-ID: CVE-2025-59249)

The vulnerability allows a remote user to bypass authentication process.

The vulnerability exists due to usage of weak authentication process. A remote user can take over an admin account and use it to compromise mailboxes of other application users. 

2) Input validation error (CVE-ID: CVE-2025-59248)

The vulnerability allows a remote attacker to gain access to sensitive information. 

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can perform spoofing attack and gain access to sensitive information.

3) Improper authentication (CVE-ID: CVE-2025-53782)

The vulnerability allows a local user to bypass authentication process.

The vulnerability exists due to incorrect implementation of authentication process. A local user can execute arbitrary code with elevated privileges. 

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-59249
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-59248
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-53782