{"id":"CVE-2026-75874","state":"PUBLISHED","title":"Sandbox escape in the Remote Settings Client component","description":"Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 140.15, and Thunderbird 153.2.","publishedAt":"2026-08-18T12:23:35.478Z","updatedAt":"2026-09-01T21:44:07.705Z","severity":{"score":10,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"mozilla","products":["Mozilla Firefox","Mozilla Thunderbird"],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"115.40","status":"unaffected","lessThanOrEqual":"115.*","versionType":"rpm"},{"version":"140.15","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"153.2","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"154","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"140.15","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"153.2","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"154","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=2039972","https://www.mozilla.org/security/advisories/mfsa2026-74/","https://www.mozilla.org/security/advisories/mfsa2026-78/","https://www.mozilla.org/security/advisories/mfsa2026-83/","https://www.mozilla.org/security/advisories/mfsa2026-84/","https://www.mozilla.org/security/advisories/mfsa2026-85/","https://www.mozilla.org/security/advisories/mfsa2026-87/","https://www.mozilla.org/security/advisories/mfsa2026-88/"],"weaknesses":["CWE-693"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/75xxx/CVE-2026-75874.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-75874","state":"PUBLISHED","datePublished":"2026-08-18T12:23:35.478Z","dateUpdated":"2026-09-01T21:44:07.705Z","assignerShortName":"mozilla","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateReserved":"2026-08-18T12:23:35.313Z"},"containers":{"cna":{"title":"Sandbox escape in the Remote Settings Client component","descriptions":[{"lang":"en","value":"Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 140.15, and Thunderbird 153.2."}],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"115.40","status":"unaffected","lessThanOrEqual":"115.*","versionType":"rpm"},{"version":"140.15","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"153.2","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"154","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"140.15","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"153.2","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"154","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2039972"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-74/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-78/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-83/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-84/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-85/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-87/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-88/"}],"providerMetadata":{"shortName":"mozilla","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateUpdated":"2026-09-01T21:44:07.705Z"},"credits":[{"lang":"en","value":"crixer"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"CHANGED","version":"3.1","baseScore":10,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-08-18T19:23:52.490532Z","id":"CVE-2026-75874","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-693","type":"CWE","lang":"en","description":"CWE-693 Protection Mechanism Failure"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-18T19:24:04.720Z"}}]}}}