{"id":"CVE-2026-55040","vendor_project":"Microsoft","product":"SharePoint","vulnerability_name":"Microsoft SharePoint Weak Authentication Vulnerability","date_added":"2026-08-18","due_date":"2026-08-21","known_ransomware_use":"Unknown","short_description":"Microsoft SharePoint contains a weak authentication vulnerability which allows an unauthorized attacker to bypass a security feature over a network.","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","cwes":"CWE-1390","cvss_version":"3.1","cvss_severity":"CRITICAL","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","nvd_published":"2026-07-14","nvd_status":"Analyzed","epss":0.50585,"epss_percentile":0.98866,"cvss_score":9.1,"days_published_to_kev":35,"source":"https://data.cybermax-tools.workers.dev/cve/CVE-2026-55040","by":"CyberMax"}