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Description

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

PUBLISHED Reserved 2026-06-16 | Published 2026-07-14 | Updated 2026-07-14 | Assigner microsoft




CRITICAL: 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

Problem types

CWE-1390: Weak Authentication

Product status

16.0.0 (custom) before 16.0.5561.1001
affected

16.0.0 (custom) before 16.0.10417.20175
affected

16.0.0 (custom) before 16.0.19725.20434
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55040 (Microsoft SharePoint Server Security Feature Bypass Vulnerability) vendor-advisory patch

cve.org (CVE-2026-55040)

nvd.nist.gov (CVE-2026-55040)

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