CVE-2026-42831

{"id": "CVE-2026-42831", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2026-05-12T18:17:25.673", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42831", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-122"}]}], "descriptions": [{"lang": "en", "value": "Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally."}], "lastModified": "2026-05-22T14:49:53.277", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:android:*:*", "vulnerable": true, "matchCriteriaId": "71B289C6-6C8F-4217-AA2A-06931EE86372", "versionEndExcluding": "16.0.19822.20190"}, {"criteria": "cpe:2.3:a:microsoft:office:2024:*:*:*:ltsc:macos:*:*", "vulnerable": true, "matchCriteriaId": "873BD998-9D5A-4C09-A3B3-4DB12ABB6F72"}, {"criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*", "vulnerable": true, "matchCriteriaId": "BF0E8112-5B6F-4E55-8E40-38ADCF6FC654"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}