Summary
Impact: Remote Code Execution. Microsoft rating: Critical. Not known to be exploited — Exploitation More Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An authenticated attacker with low-level access to an affected server could send a specially crafted request to execute code on the server. User interaction is not required.
Security updates
15.02.2562.057 — https://support.microsoft.com/en-us/servicing/exchange/server/update/2026/5133453
Vulnerabilities 1
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High 8.8
Microsoft Exchange Server Remote Code Execution Vulnerability
Improper input validation in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
Revision history
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#1
Information published.
References
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CVE-2026-118207 Microsoft Exchange Server Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118207
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss