CVE-2026-20953

{"id": "CVE-2026-20953", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.4, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.5}]}, "published": "2026-01-13T18:16:23.150", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20953", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "Use after free in Microsoft Office allows an unauthorized attacker to execute code locally."}], "lastModified": "2026-01-14T19:56:25.570", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*", "vulnerable": true, "matchCriteriaId": "3259EBFE-AE2D-48B8-BE9A-E22BBDB31378"}, {"criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*", "vulnerable": true, "matchCriteriaId": "CD25F492-9272-4836-832C-8439EBE64CCF"}, {"criteria": "cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "72324216-4EB3-4243-A007-FEF3133C7DF9"}, {"criteria": "cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x86:*", "vulnerable": true, "matchCriteriaId": "0FBB0E61-7997-4F26-9C07-54912D3F1C10"}, {"criteria": "cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "CF5DDD09-902E-4881-98D0-CB896333B4AA"}, {"criteria": "cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:*", "vulnerable": true, "matchCriteriaId": "26A3B226-5D7C-4556-9350-5222DC8EFC2C"}, {"criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*", "vulnerable": true, "matchCriteriaId": "851BAC4E-9965-4F40-9A6C-B73D9004F4C1"}, {"criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:*", "vulnerable": true, "matchCriteriaId": "23B2FA23-76F4-4D83-A718-B8D04D7EA37B"}, {"criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*", "vulnerable": true, "matchCriteriaId": "BF0E8112-5B6F-4E55-8E40-38ADCF6FC654"}, {"criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:*", "vulnerable": true, "matchCriteriaId": "D31E509A-0B2E-4B41-88C4-0099E800AFE6"}, {"criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:*", "vulnerable": true, "matchCriteriaId": "017A7041-BEF1-4E4E-AC8A-EFC6AFEB01FE"}, {"criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:macos:*:*", "vulnerable": true, "matchCriteriaId": "EF3E56B5-E6A6-4061-9380-D421E52B9199"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}