{"id":"CVE-2026-45455","title":"Microsoft Excel Information Disclosure Vulnerability","summary":"Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.","severity":"low","cvss":3.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-125"],"vendor":"Microsoft","product":"Microsoft 365 Apps for Enterprise","affected":["365_apps_for_enterprise >= 16.0.1 < https://aka.ms/OfficeSecurityReleases","excel_2016 >= 16.0.0.0 < 16.0.5556.1001","office_2019 >= 19.0.0 < https://aka.ms/OfficeSecurityReleases","office_365_for_mac >= 1.0.0 < 16.110.26061317","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 < 16.110.26061317","office_ltsc_for_mac_2024 >= 16.0.0 < 16.110.26061317","office_online_server >= 16.0.0.0 < 16.0.10417.20137"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-10T13:48:15.258965Z"},"published":"2026-06-09","updated":"2026-09-24","sourceUpdated":"2026-09-24T13:44:20.044Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-45455","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45455","label":"Microsoft Excel Information Disclosure Vulnerability"}],"tags":["cve.org"],"epss":0.00629,"epssPercentile":0.48794,"ingestedAt":"2026-09-24T14:44:21.402Z","slug":"CVE-2026-45455","body":"## Overview\n\nOut-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.\n\n## Affected\n\n- `365_apps_for_enterprise >= 16.0.1 < https://aka.ms/OfficeSecurityReleases`\n- `excel_2016 >= 16.0.0.0 < 16.0.5556.1001`\n- `office_2019 >= 19.0.0 < https://aka.ms/OfficeSecurityReleases`\n- `office_365_for_mac >= 1.0.0 < 16.110.26061317`\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 < 16.110.26061317`\n- `office_ltsc_for_mac_2024 >= 16.0.0 < 16.110.26061317`\n- `office_online_server >= 16.0.0.0 < 16.0.10417.20137`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":18,"depthScoreParts":{"impact":18.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}