CVE-2026-42897CriticalMicrosoft CVSS 8.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C

Microsoft security update for CVE-2026-42897 — Microsoft Exchange Server

Published
May 22, 2026
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2026-42897 →

📋 Microsoft's advisory

EchelonGraph does not copy Microsoft's advisory page: its FAQ and remediation text are not shown here. Read the advisory on https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897. This page also shows what EchelonGraph holds for CVE-2026-42897, with the description from its CVE record, which the CVE Numbering Authority that assigned the CVE wrote: for a CVE Microsoft assigned, often in the words of Microsoft's own advisory.

🎯 Affected products4

  • 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

✅ Updates Microsoft lists: 4 updates

4 rows: one per KB article or update, update type and fixed build. Their details are on Microsoft's advisory.

KB articleUpdateFixed build
—Security Update15.01.2507.069
—Security Update15.02.1544.041
—Security Update15.02.1748.046
—Security Update15.02.2562.043

🧭 EchelonGraph on CVE-2026-42897

EchelonGraph score
9.0 CRITICAL
CISA KEV
Listed since May 15, 2026
Fix status
A fix is available — apply it.

Description from the CVE record (CVE.org), as published by its numbering authority

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.

Published by Microsoft Corporation, the CVE Numbering Authority that assigned CVE-2026-42897, in its CVE record at CVE.org; reused under the CVE Program's Terms of Use (its licence and MITRE's copyright notice are in our Terms of Service).

🔗 References (6)