{"id":"CVE-2026-45659","title":"Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","summary":"Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-502"],"vendor":"microsoft","product":"sharepoint_server","affected":["sharepoint_server < 16.0.19725.20280","sharepoint_server = 2016","sharepoint_server = 2019"],"patched":["sharepoint_server 16.0.19725.20280"],"published":"2026-05-22","updated":"2026-07-02","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-45659","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659","label":"secure@microsoft.com"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45659","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","kev","in-the-wild","exploit-available"],"epss":0.76075,"epssPercentile":0.99521,"kev":true,"kevDateAdded":"2026-07-01","kevDueDate":"2026-07-04","kevRansomware":true,"exploited":true,"ingestedAt":"2026-07-02T05:23:56.583Z","exploits":{"github":1,"githubRepos":["https://github.com/HORKimhab/CVE-2026-45659"],"checkedAt":"2026-09-21T15:29:07.472Z"},"exploitAvailable":true,"slug":"CVE-2026-45659","body":"## Overview\n\nDeserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.\n\n## Affected\n\n- `sharepoint_server < 16.0.19725.20280`\n- `sharepoint_server = 2016`\n- `sharepoint_server = 2019`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `sharepoint_server 16.0.19725.20280`","depth":"abyssal","depthScore":94,"depthScoreParts":{"impact":48.4,"likelihood":15.2,"exploitation":25,"ransomware":5},"changes":[{"seq":5242,"id":"CVE-2026-45659","ts":1788887256133,"field":"exploit_available","old":"false","new":"true"},{"seq":4125,"id":"CVE-2026-45659","ts":1788886372555,"field":"exploit_available","old":"true","new":"false"},{"seq":2898,"id":"CVE-2026-45659","ts":1788883037989,"field":"exploit_available","old":"false","new":"true"},{"seq":1927,"id":"CVE-2026-45659","ts":1788882441455,"field":"exploit_available","old":"true","new":"false"},{"seq":1016,"id":"CVE-2026-45659","ts":1788881876325,"field":"exploit_available","old":"false","new":"true"},{"seq":175,"id":"CVE-2026-45659","ts":1787603635073,"field":"epss","old":"0.09863","new":"0.76075"},{"seq":89,"id":"CVE-2026-45659","ts":1784920481734,"field":"epss","old":"0.03219","new":"0.0912"}]}