#VU122555 Spoofing attack in Microsoft Exchange Server - CVE-2026-21527

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Main Vulnerability Database Vulnerabilities #VU122555

#VU122555 Spoofing attack in Microsoft Exchange Server - CVE-2026-21527

Published: February 10, 2026 / Updated: February 19, 2026


Vulnerability identifier: #VU122555
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-21527
CWE-ID: CWE-451
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Microsoft Exchange Server
Software vendor:
Microsoft

Description

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 updates from vendor's website.

External links