{"id":"CVE-2026-55128","title":"Microsoft Word Remote Code Execution Vulnerability","summary":"Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-416"],"vendor":"Microsoft","product":"Microsoft 365 Apps for Enterprise","affected":["365_apps_for_enterprise >= 16.0.1 < https://aka.ms/OfficeSecurityReleases","office_2019 >= 19.0.0 < https://aka.ms/OfficeSecurityReleases","office_365_for_mac >= 1.0.0 < 16.111.26071215","office_ltsc_2021 >= 16.0.1 < https://aka.ms/OfficeSecurityReleases","office_ltsc_2024 >= 16.0.0 < https://aka.ms/OfficeSecurityReleases","office_ltsc_for_mac_2021 >= 16.0.1 < 16.111.26071215","office_ltsc_for_mac_2024 >= 16.0.0 < 16.111.26071215","sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5561.1001","sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20175","sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20434","word_2016 >= 16.0.1 < 16.0.5561.1000"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-07-15T03:57:04.985731Z"},"published":"2026-07-14","updated":"2026-09-17","sourceUpdated":"2026-09-17T22:33:01.339Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55128","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55128","label":"Microsoft Word Remote Code Execution Vulnerability"}],"tags":["cve.org"],"epss":0.00571,"epssPercentile":0.45724,"ingestedAt":"2026-09-08T17:06:31.908Z","slug":"CVE-2026-55128","body":"## Overview\n\nUse after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.\n\n## Affected\n\n- `365_apps_for_enterprise >= 16.0.1 < https://aka.ms/OfficeSecurityReleases`\n- `office_2019 >= 19.0.0 < https://aka.ms/OfficeSecurityReleases`\n- `office_365_for_mac >= 1.0.0 < 16.111.26071215`\n- `office_ltsc_2021 >= 16.0.1 < https://aka.ms/OfficeSecurityReleases`\n- `office_ltsc_2024 >= 16.0.0 < https://aka.ms/OfficeSecurityReleases`\n- `office_ltsc_for_mac_2021 >= 16.0.1 < 16.111.26071215`\n- `office_ltsc_for_mac_2024 >= 16.0.0 < 16.111.26071215`\n- `sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5561.1001`\n- `sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20175`\n- `sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20434`\n- `word_2016 >= 16.0.1 < 16.0.5561.1000`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}