CVE-2026-55040CriticalMicrosoft CVSS 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C

Microsoft security update for CVE-2026-55040 — Microsoft SharePoint

Published
July 17, 2026
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2026-55040 →

📋 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-2026-55040. This page also shows what EchelonGraph holds for CVE-2026-55040, 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 products3

  • Microsoft SharePoint Enterprise Server 2016
  • Microsoft SharePoint Server 2019
  • Microsoft SharePoint Server Subscription Edition

✅ Updates Microsoft lists: 3 updates

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

KB articleUpdateFixed build
—Security Update16.0.5561.1001
—Security Update16.0.10417.20175
—Security Update16.0.19725.20434

🧭 EchelonGraph on CVE-2026-55040

EchelonGraph score
9.1 CRITICAL
CISA KEV
Listed since August 18, 2026
Fix status
A fix is available — apply it.

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

Weak authentication in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over a network.

Published by Microsoft Corporation, the CVE Numbering Authority that assigned CVE-2026-55040, 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 (7)