CVE-2026-21527HighMicrosoft CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C

Microsoft security update for CVE-2026-21527 — Microsoft Exchange Server

Published
February 10, 2026
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2026-21527 →

📋 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-2026-21527. This page also shows what EchelonGraph holds for CVE-2026-21527, 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 Update15.02.2562.037
—Security Update15.01.2507.066
—Security Update15.02.1748.043
—Security Update15.02.1544.039

🧭 EchelonGraph on CVE-2026-21527

EchelonGraph score
6.5 MEDIUM
CISA KEV
Not listed
Fix status
A fix is available — apply it.

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

User interface (ui) misrepresentation of critical information 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-2026-21527, 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)