cve-2026-55040

{
  "cvss": 9.1,
  "datePublished": "2026-08-12T00:00:00Z",
  "dateUpdated": "2026-08-12T00:00:00Z",
  "description": "Microsoft SharePoint contains a weak authentication vulnerability which allows an unauthorized attacker to bypass a security feature over a network.",
  "dueDate": "2026-08-21T00:00:00Z",
  "id": "CVE-2026-55040",
  "kev_catalogs": [
    "vulncheck"
  ],
  "knownRansomwareCampaignUse": "Unknown",
  "product": "SharePoint",
  "requiredAction": "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.",
  "severity": "CRITICAL",
  "source": "vulncheck_kev",
  "title": "Microsoft SharePoint Weak Authentication Vulnerability",
  "vendor": "Microsoft"
}