{"containers": {"cna": {"affected": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 83"}]}, {"product": "Firefox ESR", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 78.5"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 78.5"}]}], "descriptions": [{"lang": "en", "value": "Firefox did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker. This could lead to a cross-site script inclusion vulnerability, or a Content Security Policy bypass. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5."}], "problemTypes": [{"descriptions": [{"description": "Requests intercepted through ServiceWorkers lacked MIME type restrictions", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2020-12-09T00:22:19", "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1669355"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-50/"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-52/"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-51/"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@mozilla.org", "ID": "CVE-2020-26958", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Firefox", "version": {"version_data": [{"version_value": "< 83"}]}}, {"product_name": "Firefox ESR", "version": {"version_data": [{"version_value": "< 78.5"}]}}, {"product_name": "Thunderbird", "version": {"version_data": [{"version_value": "< 78.5"}]}}]}, "vendor_name": "Mozilla"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Firefox did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker. This could lead to a cross-site script inclusion vulnerability, or a Content Security Policy bypass. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "Requests intercepted through ServiceWorkers lacked MIME type restrictions"}]}]}, "references": {"reference_data": [{"name": "https://bugzilla.mozilla.org/show_bug.cgi?id=1669355", "refsource": "MISC", "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1669355"}, {"name": "https://www.mozilla.org/security/advisories/mfsa2020-50/", "refsource": "CONFIRM", "url": "https://www.mozilla.org/security/advisories/mfsa2020-50/"}, {"name": "https://www.mozilla.org/security/advisories/mfsa2020-52/", "refsource": "CONFIRM", "url": "https://www.mozilla.org/security/advisories/mfsa2020-52/"}, {"name": "https://www.mozilla.org/security/advisories/mfsa2020-51/", "refsource": "CONFIRM", "url": "https://www.mozilla.org/security/advisories/mfsa2020-51/"}]}}}}, "cveMetadata": {"assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "assignerShortName": "mozilla", "cveId": "CVE-2020-26958", "datePublished": "2020-12-09T00:22:19", "dateReserved": "2020-10-12T00:00:00", "dateUpdated": "2020-12-09T00:22:19", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.0"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*", "matchCriteriaId": "9385C808-43DD-4D02-B1A9-89A2E3986DF2", "versionEndExcluding": "83.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*", "matchCriteriaId": "36160ED9-05B8-4E38-8C67-49EE1738AF8B", "versionEndExcluding": "78.5", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "C169EC17-3490-437D-A36B-40C3DE316175", "versionEndExcluding": "78.5", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "descriptions": [{"lang": "en", "value": "Firefox did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker. This could lead to a cross-site script inclusion vulnerability, or a Content Security Policy bypass. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5."}, {"lang": "es", "value": "Firefox no bloque\u00f3 una ejecuci\u00f3n de scripts con tipos MIME incorrectos cuando la respuesta fue interceptada y almacenada en cach\u00e9 por medio de un ServiceWorker. Esto podr\u00eda conllevar a una vulnerabilidad de inclusi\u00f3n de cross-site script, o una omisi\u00f3n de Content Security Policy. Esta vulnerabilidad afecta a Firefox versiones anteriores a 83, Firefox ESR versiones anteriores a 78.5, y Thunderbird versiones anteriores a 78.5"}], "id": "CVE-2020-26958", "lastModified": "2020-12-10T18:03:45.017", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-12-09T01:15:13.080", "references": [{"source": "security@mozilla.org", "tags": ["Issue Tracking", "Permissions Required", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1669355"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-50/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-51/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-52/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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