{"id":"CVE-2026-58644","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-58644","summary":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","details":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","published":"2026-07-14T17:17:14.257","modified":"2026-07-17T05:16:40.470","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.15873,"percentile":0.96624,"asOf":"2026-08-24"},"cisaKev":{"dateAdded":"2026-07-16","dueDate":"2026-07-19","knownRansomwareCampaignUse":false},"exploitsKnown":0,"affectedPackages":[],"fix":null,"references":[{"type":"FIX","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58644"},{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-58644"}],"provenance":{"sources":["OSV.dev","NVD","CISA KEV","FIRST.org (EPSS)"],"lastVerified":"2026-07-17T05:16:40.470"}}