Nundina › Discover calendars › CISA Known Exploited Vulnerabilities calendar › CVE-2026-55040 - Microsoft SharePointCVE-2026-55040 - Microsoft SharePoint18 August 2026Microsoft SharePoint Weak Authentication Vulnerability. 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...CISA Known Exploited Vulnerabilities calendarMore from this calendar

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