CVE-2026-55040CISA KEVEPSS p99.3%

CVE-2026-55040Microsoft SharePoint Weak Authentication Vulnerability

Microsoft / SharePoint

Description

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

Scoring

CVSS 9.1 ()
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS69.54% probability of exploitation · percentile 99.3% · 2026-10-05T12:00:23Z
Last modified2026-08-19

CISA KEV entry

Added to KEV: 2026-08-18

Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.