CVE

CVE-2026-55040

Microsoft SharePoint Weak Authentication Vulnerability

Microsoft · SharePoint

Date added (CISA)

2026-08-18

Remediation due

2026-08-21

Known ransomware use

Not indicated

Remediation priority

P2 — past CISA due date

Associated with

Related to

Lazarus Group (TraderTraitor cluster) / APT38 / BlueNoroff · SPECTREcampaignCorrelated cluster2026-09-16

Description

Microsoft SharePoint contains a weak authentication vulnerability which allows an unauthorized attacker to bypass a security feature over a network.