Disclosure summary
Microsoft SharePoint Server contains a deserialization of untrusted data vulnerability which allows an authorized attacker to execute code over a network.
CISA remediation guidance
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.
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
CERT-EU Security Advisories · RSS-58275f01b5d12802890b325fa6af0049f53
Open original source · Updated Jul 23, 2026
2026-009: Critical Vulnerabilities in Microsoft SharePoint
CVE mention in publisher metadata; check the original affected versions.
Original records & references
PUBLISHED 2026-07-01T00:00:00-04:00
MODIFIED 2026-07-01T00:00:00-04:00
INGESTED 2026-10-06T11:42:57-04:00