CVE-2026-55040: Microsoft SharePoint
Microsoft SharePoint contains a weak authentication vulnerability which allows an unauthorized attacker to bypass a security feature over a network.
- Vendor
- Microsoft
- Product
- SharePoint
- Vulnerability
- Microsoft SharePoint Weak Authentication Vulnerability
- Date added
- Aug 18, 2026
- CISA due date (U.S. federal agencies)
- Aug 21, 2026
- Known ransomware campaign use
- Unknown
- Weakness (CWE)
- CWE-1390
References
This site summarizes CISA's catalog for information only. It is not security advice — follow your vendor's guidance and official advisories.
Last updated: · Catalog version 2026.10.02