VULNERABILITY INTELLIGENCE
CVE-2026-55040
CVSS score9.1 CRITICAL
EPSS probability69.54%
CISA KEVKnown exploited vulnerability
Published2026-07-14
Last modified2026-08-19
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Known Exploited Vulnerability
Microsoft SharePoint Weak Authentication Vulnerability
Vendor / product: Microsoft / SharePoint
Description
Weak authentication in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over a network.
Weakness classification
- secure@microsoft.com: CWE-1390
Primary references
- secure@microsoft.com — Patch, Vendor Advisory
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Third Party Advisory
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 — US Government Resource