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CVE-2026-45583: Microsoft Exchange Server Remote Code Execution Vulnerability

highCVSS 7.5CVE-2026-45583
Improper control of generation of code ('code injection') in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: Exchange ServerRemote code execution
What
Improper control of generation of code in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
Who is affected
Users of Microsoft Exchange Server.
Urgency
Remediation is urgent due to the high severity and potential for remote code execution.
Action
Install the latest security updates for Microsoft Exchange Server.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.5
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45583

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-45583coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Exchange Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center