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13/02/2026
Zero-Day Initiative

ZDI-26-082: Microsoft Exchange InterceptorSmtpAgent Reliance on Untrusted Inputs Security Feature Bypass Vulnerability

by Deepanshu Jha
This vulnerability allows remote attackers to bypass a security feature on affected installations of Microsoft Exchange. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 5.3. The following CVEs are assigned: CVE-2026-21527.
  • Next ZDI-26-083: Microsoft Windows searchConnector-ms NTLM Response Information Disclosure Vulnerability
  • Previous ZDI-26-081: Microsoft Windows win32kfull Use-After-Free Local Privilege Escalation Vulnerability

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