{"affected":[{"platforms":["32-bit Systems","x64-based Systems"],"product":"Microsoft 365 Apps for Enterprise","source":"CNA: microsoft","vendor":"Microsoft","versions":[{"lessThan":"https://aka.ms/OfficeSecurityReleases","status":"affected","version":"16.0.1","versionType":"custom"}]},{"platforms":["32-bit Systems","x64-based Systems"],"product":"Microsoft Office 2016","source":"CNA: microsoft","vendor":"Microsoft","versions":[{"lessThan":"16.0.5561.1000","status":"affected","version":"16.0.0","versionType":"custom"}]},{"platforms":["32-bit Systems","x64-based Systems"],"product":"Microsoft Office 2019","source":"CNA: microsoft","vendor":"Microsoft","versions":[{"lessThan":"https://aka.ms/OfficeSecurityReleases","status":"affected","version":"19.0.0","versionType":"custom"}]},{"product":"Microsoft Office 365 for Mac","source":"CNA: microsoft","vendor":"Microsoft","versions":[{"lessThan":"16.111.26071215","status":"affected","version":"1.0.0","versionType":"custom"}]},{"platforms":["32-bit Systems","x64-based Systems"],"product":"Microsoft Office LTSC 2021","source":"CNA: microsoft","vendor":"Microsoft","versions":[{"lessThan":"https://aka.ms/OfficeSecurityReleases","status":"affected","version":"16.0.1","versionType":"custom"}]},{"platforms":["32-bit Systems","x64-based Systems"],"product":"Microsoft Office LTSC 2024","source":"CNA: microsoft","vendor":"Microsoft","versions":[{"lessThan":"https://aka.ms/OfficeSecurityReleases","status":"affected","version":"16.0.0","versionType":"custom"}]},{"product":"Microsoft Office LTSC for Mac 2021","source":"CNA: microsoft","vendor":"Microsoft","versions":[{"lessThan":"16.111.26071215","status":"affected","version":"16.0.1","versionType":"custom"}]},{"product":"Microsoft Office LTSC for Mac 2024","source":"CNA: microsoft","vendor":"Microsoft","versions":[{"lessThan":"16.111.26071215","status":"affected","version":"16.0.0","versionType":"custom"}]},{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Enterprise Server 2016","source":"CNA: microsoft","vendor":"Microsoft","versions":[{"lessThan":"16.0.5561.1001","status":"affected","version":"16.0.0","versionType":"custom"}]},{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server 2019","source":"CNA: microsoft","vendor":"Microsoft","versions":[{"lessThan":"16.0.10417.20175","status":"affected","version":"16.0.0","versionType":"custom"}]},{"platforms":["x64-based Systems"],"product":"Microsoft SharePoint Server Subscription Edition","source":"CNA: microsoft","vendor":"Microsoft","versions":[{"lessThan":"16.0.19725.20434","status":"affected","version":"16.0.0","versionType":"custom"}]}],"cveId":"CVE-2026-55121","cwes":["CWE-125"],"description":"Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.","epss":{"date":"2026-11-10","percentile":0.44049,"score":0.00513},"exploits":[],"kev":null,"metrics":[{"score":5.5,"severity":"medium","source":"CNA: microsoft","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","version":"3.1"}],"modifiedAt":1794350458609,"publishedAt":1784049017586,"references":[{"source":"CNA: microsoft","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55121"}],"remediation":[{"kind":"fix","source":"CNA: microsoft","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55121"}],"revision":"cf3e62426a056028fd82e50fbb5f593948dfd41ab407b2d26db71ab71e0ddd06","sources":[{"modifiedAt":1794350458609,"name":"CNA: microsoft","retrievedAt":1794353088337,"url":"https://www.cve.org/CVERecord?id=CVE-2026-55121"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794353098450,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-55121"}],"ssvc":{"assessedAt":1784051166794,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Microsoft Office Information Disclosure Vulnerability","updatedAt":1794353098450}