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Microsoft Security Response CenterCVE-2026-118154

Microsoft Exchange Server Elevation of Privilege Vulnerability

HighVendor CVSS 8.8 / 10 1 CVE Published Nov 10, 2026 at 8:00 AM UTC

Summary

Reliance on untrusted inputs in a security decision in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Products covered

  • Microsoft Exchange Server Subscription Edition RTM

Remediation

Install KB5133453.

Vendor-listed fixes

  • 15.02.2562.057

CVEs in this advisory 1

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.