{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-16387", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "state": "PUBLISHED", "assignerShortName": "mozilla", "dateReserved": "2026-07-20T21:57:05.138Z", "datePublished": "2026-07-21T12:38:01.478Z", "dateUpdated": "2026-07-22T19:18:50.988Z"}, "containers": {"cna": {"affected": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "140.13", "lessThanOrEqual": "140.*", "versionType": "rpm"}, {"status": "unaffected", "version": "153", "lessThanOrEqual": "*", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "140.13", "lessThanOrEqual": "140.*", "versionType": "rpm"}, {"status": "unaffected", "version": "153", "lessThanOrEqual": "*", "versionType": "rpm"}]}], "descriptions": [{"lang": "en", "value": "Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13."}]}], "title": "Site isolation issue in the Networking component", "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2043200"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-68/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-70/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-71/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-72/"}], "credits": [{"lang": "en", "value": "Atsushi Sada"}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-07-22T19:18:50.988Z"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-346", "lang": "en", "description": "CWE-346 Origin Validation Error"}]}, {"descriptions": [{"type": "CWE", "cweId": "CWE-284", "lang": "en", "description": "CWE-284 Improper Access Control"}]}, {"descriptions": [{"type": "CWE", "cweId": "CWE-200", "lang": "en", "description": "CWE-200 Exposure of Sensitive Information to an Unauthorized Actor"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/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"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-07-22T17:14:57.789549Z", "id": "CVE-2026-16387", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-22T17:28:58.318Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/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"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-16387", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-07-22T17:14:57.789549Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-346", "description": "CWE-346 Origin Validation Error"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-284", "description": "CWE-284 Improper Access Control"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-200", "description": "CWE-200 Exposure of Sensitive Information to an Unauthorized Actor"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-22T17:15:31.331Z"}}], "cna": {"title": "Site isolation issue in the Networking component", "credits": [{"lang": "en", "value": "Atsushi Sada"}], "affected": [{"vendor": "Mozilla", "product": "Firefox", "versions": [{"status": "unaffected", "version": "140.13", "versionType": "rpm", "lessThanOrEqual": "140.*"}, {"status": "unaffected", "version": "153", "versionType": "rpm", "lessThanOrEqual": "*"}]}, {"vendor": "Mozilla", "product": "Thunderbird", "versions": [{"status": "unaffected", "version": "140.13", "versionType": "rpm", "lessThanOrEqual": "140.*"}, {"status": "unaffected", "version": "153", "versionType": "rpm", "lessThanOrEqual": "*"}]}], "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2043200"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-68/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-70/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-71/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-72/"}], "descriptions": [{"lang": "en", "value": "Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.", "supportingMedia": [{"type": "text/html", "value": "Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.", "base64": false}]}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-07-22T19:18:50.988Z"}}}, "cveMetadata": {"cveId": "CVE-2026-16387", "state": "PUBLISHED", "dateUpdated": "2026-07-22T19:18:50.988Z", "dateReserved": "2026-07-20T21:57:05.138Z", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "datePublished": "2026-07-21T12:38:01.478Z", "assignerShortName": "mozilla"}, "dataVersion": "5.2"}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[140.13,141.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[153,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox", "source": "cna", "vendor": "Mozilla"}, "product": "firefox", "vendor": "mozilla"}], "created": "2026-07-22T02:30:13.170371+00:00", "updated": "2026-07-22T02:30:13.170394+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox"]}