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Microsoft Security Response CenterCVE-2026-42897

Microsoft Exchange Server Spoofing Vulnerability

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.

Read the vendor bulletin Get alerts for Microsoft Exchange Server 2016 Cumulative Update
8.1CVSS out of 10Critical severity
Scope

What the vendor says is affected

  • 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

Versions the vendor lists as fixed

  • 15.01.2507.069
  • 15.02.1544.041
  • 15.02.1748.046
  • 15.02.2562.043
Next step

What the vendor recommends

Install KB5094144. Install KB5094142. Install KB5094140. Install KB5094139.

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-42897View CVSS, KEV, EPSS, and threat context
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