SB2026021066 - Spoofing attack in Microsoft Exchange Server
Published: February 10, 2026 Updated: February 19, 2026
Security Bulletin ID
SB2026021066
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Spoofing attack (CVE-ID: CVE-2026-21527)
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data within the InterceptorSmtpAgent class. A remote attacker can perform spoofing attack against Exchange users.
Remediation
Install update from vendor's website.