{"id":"CVE-2026-45659","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-45659","summary":"Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","details":"Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","published":"2026-05-22T23:16:56.273","modified":"2026-07-23T11:10:00.120","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.09863,"percentile":0.95133,"asOf":"2026-08-14"},"cisaKev":{"dateAdded":"2026-07-01","dueDate":"2026-07-04","knownRansomwareCampaignUse":true},"exploitsKnown":0,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659"},{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45659"}],"provenance":{"sources":["OSV.dev","NVD","CISA KEV","FIRST.org (EPSS)"],"lastVerified":"2026-07-23T11:10:00.120"}}