{"id":"CVE-2026-40358","published":"2026-05-12T16:59:17Z","modified":"2026-08-10T15:13:26Z","title":"Microsoft Office Remote Code Execution Vulnerability","vendor":"Microsoft","product":"Microsoft 365 Apps for Enterprise","tier":"tail","description":{"text":"Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.","provenance":"source","from":"CVE.org"},"cvss":{"score":8.4,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00369,"percentile":0.30663,"provenance":"source"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40358","tags":["vendor-advisory","patch"]}],"priority":{"score":12.0,"factors":[{"name":"EPSS percentile","points":6.13},{"name":"CVSS severity","points":5.88}]},"vendorSlug":"microsoft","affectedVersions":[{"vendor":"Microsoft","product":"Microsoft 365 Apps for Enterprise","versions":[">= 16.0.1, < https://aka.ms/OfficeSecurityReleases"]},{"vendor":"Microsoft","product":"Microsoft Office 2016","versions":[">= 16.0.0, < 16.0.5552.1000"]},{"vendor":"Microsoft","product":"Microsoft Office 2019","versions":[">= 19.0.0, < https://aka.ms/OfficeSecurityReleases"]},{"vendor":"Microsoft","product":"Microsoft Office LTSC 2021","versions":[">= 16.0.1, < https://aka.ms/OfficeSecurityReleases"]},{"vendor":"Microsoft","product":"Microsoft Office LTSC 2024","versions":[">= 16.0.0, < https://aka.ms/OfficeSecurityReleases"]},{"vendor":"Microsoft","product":"Microsoft Office LTSC for Mac 2021","versions":[">= 16.0.1, < 16.109.26051019"]},{"vendor":"Microsoft","product":"Microsoft Office LTSC for Mac 2024","versions":[">= 16.0.0, < 16.109.26051019"]}],"euvd":{"id":"EUVD-2026-29640","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-microsoft-office-cwe-416"}}