CVE-2026-58644: Microsoft SharePoint Deserialization of Untrusted Data Vulnerability Vendor/project: Microsoft Product: SharePoint Date added to KEV: 2026-07-16 Due date: 2026-07-19 Known ransomware use: Unknown CWEs: CWE-502 Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code 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. Notes: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58644 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-58644 CISA KEV catalog entry for CVE-2026-58644 Original source: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58644View original source
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