{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-16377","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","state":"PUBLISHED","assignerShortName":"mozilla","dateReserved":"2026-07-20T21:56:42.653Z","datePublished":"2026-07-21T12:37:52.135Z","dateUpdated":"2026-07-22T19:18:39.146Z"},"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":"Mitigation bypass in the PDF Viewer 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":"Mitigation bypass in the PDF Viewer component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13."}]}],"title":"Mitigation bypass in the PDF Viewer component","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2037770"},{"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":"Nikola Kojic"}],"providerMetadata":{"orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","shortName":"mozilla","dateUpdated":"2026-07-22T19:18:39.146Z"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-693","lang":"en","description":"CWE-693 Protection Mechanism Failure"}]}],"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":"2026-07-22T16:58:19.989629Z","id":"CVE-2026-16377","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":"2026-07-22T17:30:16.139Z"}}]}}