{"id":"CVE-2026-42280","aliases":["GHSA-8qjv-jj2q-x832"],"url":"https://o3.security/vulnerability/CVE-2026-42280","summary":"Improper Permission Checking in Auth.js SDK","details":"### Description\nUnder specific preconditions, the Auth0.js SDK may improperly return user profile information using a valid access token when a specifically crafted invalid ID token is provided.\n\n### Am I Affected?\nUsers are affected if they meet each of the following preconditions:\n- Applications built using Auth0.js version between 8.11.0 and 9.32.0\n- The application’s access control relies on rules defined in Auth0 Actions.\n\n\n### Affected product and versions\nauth0.js SDK v8.11.0 to v9.32.0\n\n### Resolution\nUpgrade auth0/auth0.js to v10.0.0 or greater.\n\n### Acknowledgements\nOkta would like to thank Quan Le (@aleister1102) for their discovery and responsible disclosure.","published":"2026-05-27T14:39:15.789Z","modified":"2026-10-28T02:30:52.996213115Z","cvss":{"score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"},"epss":{"score":0.00211,"percentile":0.11439,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"auth0-js","fixedVersion":"10.0.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42280.json"},{"type":"ADVISORY","url":"https://github.com/auth0/auth0.js/security/advisories/GHSA-8qjv-jj2q-x832"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42280"},{"type":"PACKAGE","url":"https://github.com/auth0/auth0.js"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:52.996213115Z"}}