{"id":"CVE-2026-8958","state":"PUBLISHED","title":"Information disclosure, sandbox escape in the Security: Process Sandboxing component","description":"Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.","publishedAt":"2026-05-19T12:29:54.014Z","updatedAt":"2026-05-19T17:10:50.174Z","severity":{"score":8.6,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/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=2034713","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-668","CWE-693"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/8xxx/CVE-2026-8958.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-8958","state":"PUBLISHED","datePublished":"2026-05-19T12:29:54.014Z","dateUpdated":"2026-05-19T17:10:50.174Z","assignerShortName":"mozilla","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateReserved":"2026-05-19T12:29:53.304Z"},"containers":{"cna":{"title":"Information disclosure, sandbox escape in the Security: Process Sandboxing component","descriptions":[{"lang":"en","value":"Information disclosure, sandbox escape in the Security: Process Sandboxing 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=2034713"},{"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":"2026-05-19T17:10:50.174Z"},"credits":[{"lang":"en","value":"Yaqoub Aldurayhim"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"CHANGED","version":"3.1","baseScore":8.6,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-05-19T15:03:48.961447Z","id":"CVE-2026-8958","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-668","type":"CWE","lang":"en","description":"CWE-668 Exposure of Resource to Wrong Sphere"}]},{"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":"2026-05-19T15:05:35.766Z"}}]}}}