{"@odata.context":"https://api.msrc.microsoft.com/sug/v2.0/sugodata/v2.0/en-US/$metadata#vulnerability/$entity","id":"00000000-0000-0000-0000-0000bd487043","releaseDate":"2026-05-21T07:00:00-07:00","cveNumber":"CVE-2026-45659","cveTitle":"Microsoft SharePoint Remote Code Execution Vulnerability","releaseNumber":"2026-May","vulnType":"Security Vulnerability","latestRevisionDate":"2026-05-26T07:00:00-07:00","description":"<p>Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.</p>\n","cweList":["CWE-502: Deserialization of Untrusted Data"],"cweDetailsListForSearch":["cwe: CWE-502: Deserialization of Untrusted Data","cweUrl: https://cwe.mitre.org/data/definitions/502.html"],"unformattedDescription":"Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","mitreText":"CVE-2026-45659","mitreUrl":"https://www.cve.org/CVERecord?id=CVE-2026-45659","publiclyDisclosed":"No","exploited":"No","latestSoftwareReleaseId":2,"latestSoftwareRelease":"Exploitation Less Likely","olderSoftwareReleaseId":0,"denialOfService":"N/A","tag":"Microsoft Office SharePoint","issuingCna":"Microsoft","issuingCnaId":100000001,"severityId":100000001,"severity":"Important","impactId":100000005,"impact":"Remote Code Execution","langCode":"en-US","baseScore":"8.8","temporalScore":"7.7","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","vectorStringSource":"Microsoft","isMariner":false,"customerActionRequired":true,"customerActionRequiredId":1,"cweDetailsList":[{"keys":["cwe","cweUrl"],"values":["CWE-502: Deserialization of Untrusted Data","https://cwe.mitre.org/data/definitions/502.html"]}],"articles":[{"title":"Microsoft Office SharePoint Remote Code Execution Vulnerability","articleType":"100000000","description":"<p>Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.</p>\n","ordinal":10000},{"articleType":"FAQ","description":"<p><strong>I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running?</strong></p>\n<p>Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability.</p>\n","ordinal":10000},{"articleType":"FAQ","description":"<p><strong>According to the CVSS metric, privileges required is low (PR:L).  What does that mean for this vulnerability?</strong></p>\n<p>Any authenticated attacker could trigger this vulnerability. It does not require admin or other elevated privileges.</p>\n","ordinal":10000},{"articleType":"FAQ","description":"<p><strong>How could an attacker exploit the vulnerability?</strong></p>\n<p>In a network-based attack, an authenticated attacker, who has a minimum of Site Member permissions (PR:L), could execute code remotely on the SharePoint Server.</p>\n","ordinal":10000},{"articleType":"FAQ","description":"<p><strong>According to the CVSS metric, the attack vector is network (AV:N) and the attack complexity is low (AC:L). What does that mean for this vulnerability?</strong></p>\n<p>The attack vector is Network (AV:N) because this vulnerability is remotely exploitable and can be exploited from the internet. The attack complexity is Low (AC:L) because an attacker does not require significant prior knowledge of the system and can achieve repeatable success with the payload against the vulnerable component.</p>\n","ordinal":10000}],"revisions":[{"cveNumber":"CVE-2026-45659","version":1.1,"revisionDate":"2026-05-26T07:00:00-07:00","initialDate":"0001-01-01T00:00:00Z","description":"<p>Information published. This CVE was addressed by updates that were released in May 2026, but the CVE was inadvertently omitted from the May 2026 Security Updates. This is an informational change only. Customers who have already installed the May 2026 updates do not need to take any further action.</p>\n","unformattedDescription":"Information published. This CVE was addressed by updates that were released in May 2026, but the CVE was inadvertently omitted from the May 2026 Security Updates. This is an informational change only. Customers who have already installed the May 2026 updates do not need to take any further action.","notificationNeeded":false,"notificationSent":false,"sourceId":"796a1e69-4b59-f111-939e-000d3ac5fb71"},{"cveNumber":"CVE-2026-45659","version":1,"revisionDate":"2026-05-21T07:00:00-07:00","initialDate":"0001-01-01T00:00:00Z","description":"<p>Information published.</p>\n","unformattedDescription":"Information published.","notificationNeeded":true,"notificationSent":true,"sourceId":"9fa86191-4b55-f111-93fb-000d3afbc7d7"}]}