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Microsoft Security Response CenterCVE-2026-45583

Microsoft Exchange Server Remote Code Execution Vulnerability

HighVendor CVSS 7.5 / 10 1 CVE Published Jun 9, 2026 at 7:00 AM UTC
Get alerts for Microsoft Exchange Server 2016 Cumulative Update

Summary

Improper control of generation of code ('code injection') in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.

Products covered

  • Microsoft Exchange Server 2016 Cumulative Update 23

  • Microsoft Exchange Server 2019 Cumulative Update 14

  • Microsoft Exchange Server 2019 Cumulative Update 15

  • Microsoft Exchange Server Subscription Edition RTM

Remediation

Install KB5103215. Install KB5103214. Install KB5103213. Install KB5103212.

Vendor-listed fixes

  • 15.01.2507.071

  • 15.02.1544.043

  • 15.02.1748.048

  • 15.02.2562.045

CVEs in this advisory 1

CVE-2026-45583

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.

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