{"id":"CVE-2026-8950","state":"PUBLISHED","title":"Same-origin policy bypass in the Networking: HTTP component","description":"Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.","publishedAt":"2026-05-19T12:29:42.239Z","updatedAt":"2026-05-19T17:10:48.079Z","severity":{"score":9.3,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","source":"CISA-ADP"},"assigner":"mozilla","products":["Mozilla Firefox","Mozilla Thunderbird"],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"140.11","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"151","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"140.11","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"151","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=1965430","https://www.mozilla.org/security/advisories/mfsa2026-46/","https://www.mozilla.org/security/advisories/mfsa2026-48/","https://www.mozilla.org/security/advisories/mfsa2026-50/","https://www.mozilla.org/security/advisories/mfsa2026-51/"],"weaknesses":["CWE-346"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/8xxx/CVE-2026-8950.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-8950","state":"PUBLISHED","datePublished":"2026-05-19T12:29:42.239Z","dateUpdated":"2026-05-19T17:10:48.079Z","assignerShortName":"mozilla","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateReserved":"2026-05-19T12:29:41.562Z"},"containers":{"cna":{"title":"Same-origin policy bypass in the Networking: HTTP component","descriptions":[{"lang":"en","value":"Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11."}],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"140.11","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"151","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"140.11","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"151","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1965430"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-46/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-48/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-50/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-51/"}],"providerMetadata":{"shortName":"mozilla","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateUpdated":"2026-05-19T17:10:48.079Z"},"credits":[{"lang":"en","value":"Jakub Szymsza"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"CHANGED","version":"3.1","baseScore":9.3,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","integrityImpact":"HIGH","userInteraction":"REQUIRED","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-05-19T15:47:45.885624Z","id":"CVE-2026-8950","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-346","type":"CWE","lang":"en","description":"CWE-346 Origin Validation Error"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-19T15:49:32.341Z"}}]}}}