{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-70309", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-08-04T00:01:20.932Z", "datePublished": "2026-08-28T17:45:35.711Z", "dateUpdated": "2026-08-28T17:45:35.711Z"}, "containers": {"cna": {"title": "Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability", "datePublic": "2026-08-28T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.0.0.0", "versionEndExcluding": "150.0.4078.65"}]}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft Edge (Chromium-based)", "versions": [{"version": "1.0.0.0", "lessThan": "150.0.4078.65", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-346: Origin Validation Error", "lang": "en-US", "type": "CWE", "cweId": "CWE-346"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-08-28T17:45:35.711Z"}, "references": [{"name": "Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70309"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 5.4, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C"}}]}}}

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{"affected": [{"affectedData": [{"product": "Microsoft Edge (Chromium-based)", "vendor": "Microsoft", "versions": [{"lessThan": "150.0.4078.65", "status": "affected", "version": "1.0.0.0", "versionType": "custom"}]}], "source": "secure@microsoft.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network."}], "id": "CVE-2026-70309", "lastModified": "2026-08-28T20:19:40.267", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.5, "source": "secure@microsoft.com", "type": "Primary"}]}, "published": "2026-08-28T20:19:40.267", "references": [{"source": "secure@microsoft.com", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70309"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-346"}], "source": "secure@microsoft.com", "type": "Primary"}]}

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