CVE-2026-55040 - Microsoft SharePoint Weak Authentication Vulnerability
Microsoft SharePoint contains a weak authentication vulnerability which allows an unauthorized attacker to bypass a security feature over a network.
- Severity
- critical
- Product
- Microsoft SharePoint
- Published
- 2026-08-18
- EPSS
- 0.695
- CISA KEV
- Known exploited
- Ransomware
- Known campaign use
References and validation
- https://github.com/search?q=CVE-2026-55040&type=repositories
- https://nvd.nist.gov/vuln/detail/CVE-2026-55040
Entries are refreshed from CISA KEV and FIRST EPSS. Validate applicability before testing.