{"id":"CVE-2026-45659","vendor_project":"Microsoft","product":"SharePoint Server","vulnerability_name":"Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability","date_added":"2026-07-01","due_date":"2026-07-04","known_ransomware_use":"Known","short_description":"Microsoft SharePoint Server contains a deserialization of untrusted data vulnerability which allows an authorized 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.","cwes":"CWE-502","cvss_version":"3.1","cvss_severity":"HIGH","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","nvd_published":"2026-05-22","nvd_status":"Analyzed","epss":0.76075,"epss_percentile":0.99509,"cvss_score":8.8,"days_published_to_kev":40,"source":"https://data.cybermax-tools.workers.dev/cve/CVE-2026-45659","by":"CyberMax"}