Server-Side Request Forgery (SSRF) in Microsoft Exchange Server - CVE-2026-45503
Published: June 9, 2026
Vulnerability identifier: #VU134072
CSH Severity: Medium
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-45503
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The disclosed vulnerability allows a remote attacker to perform SSRF attacks.
The vulnerability exists due to insufficient validation of user-supplied input in Microsoft Exchange Server. A remote user can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.
Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.
Affected software
Microsoft Exchange Server
How to mitigate CVE-2026-45503
Install updates from vendor's website.
Microsoft Exchange Server - addressed in versions 15.01.2507.069, 15.02.1544.041, 15.02.1748.046, 15.02.2562.043