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CVE-2026-55040

Microsoft SharePoint Server Security Feature Bypass Vulnerability

CVSS 3.1 9.1 CRITICALCheck source for fixed versionsKEV status unknown
Original advisory

Historical advisory recorded 28 Oct 2026 21:55:13 UTC. Read the latest advisory.

cve-program · CVE-2026-55040

Published

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

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-55040

Published

Microsoft SharePoint Server Security Feature Bypass Vulnerability

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

Source published
14 Jul 2026 17:09:00 UTC
Source modified
28 Oct 2026 20:05:40 UTC
Saved here
28 Oct 2026 21:55:13 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 15 Nov 20:10 UTC · 254 of 275 readable · 250 fully read · documentation 469/469 current

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