{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-66311", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-07-24T18:06:51.295Z", "datePublished": "2026-08-03T22:57:53.525Z", "dateUpdated": "2026-08-10T17:21:25.885Z"}, "containers": {"cna": {"title": "Microsoft Edge (Chromium-based) Tampering Vulnerability", "datePublic": "2026-07-31T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.0.0.0", "versionEndExcluding": "151.0.4129.59"}]}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft Edge (Chromium-based)", "versions": [{"version": "1.0.0.0", "lessThan": "151.0.4129.59", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-862: Missing Authorization", "lang": "en-US", "type": "CWE", "cweId": "CWE-862"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-08-10T17:21:25.885Z"}, "references": [{"name": "Microsoft Edge (Chromium-based) Tampering Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66311"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 6.2, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-04T14:19:46.424821Z", "id": "CVE-2026-66311", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-04T15:04:33.096Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-66311", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-04T14:19:46.424821Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-04T14:19:47.449Z"}}], "cna": {"title": "Microsoft Edge (Chromium-based) Tampering Vulnerability", "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "baseScore": 6.2, "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C"}, "scenarios": [{"lang": "en-US", "value": "GENERAL"}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft Edge (Chromium-based)", "versions": [{"status": "affected", "version": "1.0.0.0", "lessThan": "151.0.4129.59", "versionType": "custom"}]}], "datePublic": "2026-07-31T14:00:00.000Z", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66311", "name": "Microsoft Edge (Chromium-based) Tampering Vulnerability", "tags": ["vendor-advisory", "patch"]}], "descriptions": [{"lang": "en-US", "value": "Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally."}], "problemTypes": [{"descriptions": [{"lang": "en-US", "type": "CWE", "cweId": "CWE-862", "description": "CWE-862: Missing Authorization"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "151.0.4129.59", "versionStartIncluding": "1.0.0.0"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-08-07T18:21:58.251Z"}}}, "cveMetadata": {"cveId": "CVE-2026-66311", "state": "PUBLISHED", "dateUpdated": "2026-08-07T18:21:58.251Z", "dateReserved": "2026-07-24T18:06:51.295Z", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "datePublished": "2026-08-03T22:57:53.525Z", "assignerShortName": "microsoft"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "Microsoft Edge (Chromium-based)", "vendor": "Microsoft", "versions": [{"lessThan": "151.0.4129.59", "status": "affected", "version": "1.0.0.0", "versionType": "custom"}]}], "source": "[email protected]"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*", "matchCriteriaId": "19BB73A9-A2EE-40DE-A3AC-7C7C12FDC131", "versionEndExcluding": "151.0.4129.59", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally."}], "id": "CVE-2026-66311", "lastModified": "2026-08-06T16:58:08.037", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 6.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 3.6, "source": "[email protected]", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-66311", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-04T14:19:46.424821Z", "version": "2.0.3"}}]}, "published": "2026-08-04T00:17:38.373", "references": [{"source": "[email protected]", "tags": ["Vendor Advisory"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66311"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-862"}], "source": "[email protected]", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.0.0.0,151.0.4129.59)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Edge (Chromium-based)", "source": "cna", "vendor": "Microsoft"}, "product": "edge_chromium", "vendor": "microsoft"}], "created": "2026-08-04T01:00:05.110218+00:00", "updated": "2026-08-04T09:30:06.532465+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$edge_chromium"]}