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Microsoft Security Response CenterCVE-2026-69356

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 2019 Cumulative Update
9.3CVSS out of 10High severity
Scope

What the vendor says is affected

  • 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

Versions the vendor lists as fixed

  • 15.02.1544.046
  • 15.02.1748.051
  • 15.02.2562.049
  • 15.01.2507.073
Next step

What the vendor recommends

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

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. 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.

Vulnerabilities

CVEs named in this advisory

CVE-2026-69356View CVSS, KEV, EPSS, and threat context
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