{"api_version":"1","generated_at":"2026-08-22T02:51:23+00:00","cve":"CVE-2026-74983","urls":{"html":"https://cve.report/CVE-2026-74983","api":"https://cve.report/api/cve/CVE-2026-74983.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74983","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74983"},"summary":{"title":"Mitigation bypass in the Data Loss Prevention component","description":"Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.","state":"PUBLISHED","assigner":"mozilla","published_at":"2026-08-18 13:17:39","updated_at":"2026-08-19 15:47:50"},"problem_types":["CWE-693","CWE-693 CWE-693 Protection Mechanism Failure"],"metrics":[{"version":"3.1","source":"ADP","type":"DECLARED","score":"8.1","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","version":"3.1"}},{"version":"3.1","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","score":"8.1","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"}}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2051897","name":"https://bugzilla.mozilla.org/show_bug.cgi?id=2051897","refsource":"security@mozilla.org","tags":["Permissions Required"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-78/","name":"https://www.mozilla.org/security/advisories/mfsa2026-78/","refsource":"security@mozilla.org","tags":["Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-79/","name":"https://www.mozilla.org/security/advisories/mfsa2026-79/","refsource":"security@mozilla.org","tags":["Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-77/","name":"https://www.mozilla.org/security/advisories/mfsa2026-77/","refsource":"security@mozilla.org","tags":["Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-76/","name":"https://www.mozilla.org/security/advisories/mfsa2026-76/","refsource":"security@mozilla.org","tags":["Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-74/","name":"https://www.mozilla.org/security/advisories/mfsa2026-74/","refsource":"security@mozilla.org","tags":["Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-80/","name":"https://www.mozilla.org/security/advisories/mfsa2026-80/","refsource":"security@mozilla.org","tags":["Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74983","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74983","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Mozilla","product":"Firefox","version":"unaffected 140.14 140.* rpm","platforms":[]},{"source":"CNA","vendor":"Mozilla","product":"Firefox","version":"unaffected 153.1 153.* rpm","platforms":[]},{"source":"CNA","vendor":"Mozilla","product":"Firefox","version":"unaffected 154 * rpm","platforms":[]},{"source":"CNA","vendor":"Mozilla","product":"Thunderbird","version":"unaffected 140.14 140.* rpm","platforms":[]},{"source":"CNA","vendor":"Mozilla","product":"Thunderbird","version":"unaffected 153.1 153.* rpm","platforms":[]},{"source":"CNA","vendor":"Mozilla","product":"Thunderbird","version":"unaffected 154 * rpm","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"5up3rh3i","lang":"en"}],"nvd_cpes":[{"cve_year":"2026","cve_id":"74983","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"firefox","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74983","cve":"CVE-2026-74983","epss":"0.001710000","percentile":"0.068870000","score_date":"2026-08-19","updated_at":"2026-08-20 00:13:10"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","version":"3.1"}},{"other":{"content":{"id":"CVE-2026-74983","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-08-19T13:35:00.550070Z","version":"2.0.3"},"type":"ssvc"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-693","description":"CWE-693 Protection Mechanism Failure","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-19T13:35:04.462Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.14","versionType":"rpm"},{"lessThanOrEqual":"153.*","status":"unaffected","version":"153.1","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"154","versionType":"rpm"}]},{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.14","versionType":"rpm"},{"lessThanOrEqual":"153.*","status":"unaffected","version":"153.1","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"154","versionType":"rpm"}]}],"credits":[{"lang":"en","value":"5up3rh3i"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."}],"value":"Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."}],"providerMetadata":{"dateUpdated":"2026-08-18T18:55:23.222Z","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","shortName":"mozilla"},"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2051897"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-74/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-76/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-77/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-78/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-79/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-80/"}],"title":"Mitigation bypass in the Data Loss Prevention component"}},"cveMetadata":{"assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","assignerShortName":"mozilla","cveId":"CVE-2026-74983","datePublished":"2026-08-18T12:23:34.590Z","dateReserved":"2026-08-17T11:59:12.499Z","dateUpdated":"2026-08-19T13:35:04.462Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-18 13:17:39","lastModifiedDate":"2026-08-19 15:47:50","problem_types":["CWE-693","CWE-693 CWE-693 Protection Mechanism Failure"],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":5.2}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-19T13:35:00.550070Z","id":"CVE-2026-74983","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*","versionEndExcluding":"140.14.0","matchCriteriaId":"4104BED1-BF78-4E44-9721-C69C07284BB5"},{"vulnerable":true,"criteria":"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*","versionStartIncluding":"141.0","versionEndExcluding":"153.1.0","matchCriteriaId":"5D58C9D3-E300-408A-ABF2-6E2BB49AB921"},{"vulnerable":true,"criteria":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*","versionEndExcluding":"140.14.0","matchCriteriaId":"4E2EC2AA-23B2-45C9-8594-DF80A0D800A7"},{"vulnerable":true,"criteria":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*","versionStartIncluding":"141.0","versionEndExcluding":"153.1.0","matchCriteriaId":"47206424-A249-46CE-9776-F45A49344204"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74983","Ordinal":"1","Title":"Mitigation bypass in the Data Loss Prevention component","CVE":"CVE-2026-74983","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74983","Ordinal":"1","NoteData":"Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.","Type":"Description","Title":"Mitigation bypass in the Data Loss Prevention component"}]}}}