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Microsoft Security Response CenterCVE-2026-69356

Microsoft Exchange Server Spoofing Vulnerability

HighVendor CVSS 9.3 / 10 1 CVE Published Sep 8, 2026 at 7:00 AM UTC
Get alerts for Microsoft Exchange Server 2019 Cumulative Update

Summary

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

Products covered

  • Microsoft Exchange Server 2019 Cumulative Update 14

  • Microsoft Exchange Server 2019 Cumulative Update 15

  • Microsoft Exchange Server Subscription Edition RTM

  • Microsoft Exchange Server 2016 Cumulative Update 23

Remediation

Install KB5121610. Install KB5121609. Install KB5121608. Install KB5121611.

Vendor-listed fixes

  • 15.02.1544.046

  • 15.02.1748.051

  • 15.02.2562.049

  • 15.01.2507.073

CVEs in this advisory 1

CVE-2026-69356

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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