Reliance on Untrusted Inputs in a Security Decision in Microsoft Exchange Server Subscription Edition RTM - CVE-2026-118154
Published: November 11, 2026
Vulnerability identifier: #VU165053
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-118154
CWE-ID: CWE-807
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to escalate privileges in Microsoft Exchange Server.
The vulnerability exists due to reliance on untrusted inputs in a security decision in Microsoft Exchange Server when handling network requests. A remote user can supply untrusted input that influences a security decision to escalate privileges.
Affected software
Microsoft Exchange Server Subscription Edition RTM
How to mitigate CVE-2026-118154
Install security update from vendor's website.
Microsoft Exchange Server Subscription Edition RTM - update to 15.02.2562.057