{"id":"CVE-2026-42280","aliases":["EUVD-2026-32533","GHSA-8qjv-jj2q-x832"],"status":"published","title":"Improper Permission Checking in Auth.js SDK","description":"Auth0.js is a client-side JavaScript library for Auth0. From 8.11.0 to 9.32.0, under 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. This vulnerability is fixed in 10.0.0.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00211,"percentile":0.11415,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-863"],"published":"2026-05-06T17:05:14Z","modified":"2026-10-28T02:30:52Z","fixes":[{"ecosystem":"npm","package":"auth0-js","fixed_in":["10.0.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"auth0-js","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.11.0"},{"last_affected":"9.32.0"},{"fixed":"10.0.0"}]}]},{"source":"osv","ecosystem":"npm","package":"auth0-js","ranges":[{"type":"SEMVER","events":[{"introduced":"8.11.0"},{"fixed":"10.0.0"}]}]}],"products":[{"vendor":"auth0","product":"auth0.js"}],"references":[{"url":"https://github.com/auth0/auth0.js/security/advisories/GHSA-8qjv-jj2q-x832","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42280","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-8qjv-jj2q-x832"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42280.json","tags":["advisory"]},{"url":"https://github.com/auth0/auth0.js","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-42280","title":"Improper Permission Checking in Auth.js SDK","description":"Auth0.js is a client-side JavaScript library for Auth0. From 8.11.0 to 9.32.0, under 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. This vulnerability is fixed in 10.0.0.","status":"published","published":"2026-05-27T14:39:15.789Z","modified":"2026-05-28T15:36:56.102Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T13:40:35.004553Z"}],"euvd":[{"id":"EUVD-2026-32533","description":"Auth0.js is a client-side JavaScript library for Auth0. From 8.11.0 to 9.32.0, under 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. This vulnerability is fixed in 10.0.0.","status":"published","published":"2026-05-27T14:39:15Z","modified":"2026-05-28T15:36:56Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"high"}],"updated_at":"2026-11-02T18:21:02.581093Z"}],"ghsa":[{"id":"GHSA-8qjv-jj2q-x832","title":"Auth.js SDK has Improper Permission Checking","description":"### 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.","status":"published","published":"2026-05-06T17:05:14Z","modified":"2026-06-08T23:41:46Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"high"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:40:21.48274Z"}],"nvd":[{"id":"CVE-2026-42280","description":"Auth0.js is a client-side JavaScript library for Auth0. From 8.11.0 to 9.32.0, under 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. This vulnerability is fixed in 10.0.0.","status":"published","published":"2026-05-27T15:16:27.753Z","modified":"2026-10-26T11:10:00.157Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:12:20.885865Z"}],"osv":[{"id":"CVE-2026-42280","title":"Improper Permission Checking in Auth.js SDK","description":"Auth0.js is a client-side JavaScript library for Auth0. From 8.11.0 to 9.32.0, under 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. This vulnerability is fixed in 10.0.0.","status":"published","published":"2026-05-27T14:39:15.789Z","modified":"2026-10-28T02:30:52.996213115Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"high"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:45:04.117819Z"},{"id":"GHSA-8qjv-jj2q-x832","title":"Auth.js SDK has Improper Permission Checking","description":"### 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.","status":"published","published":"2026-05-06T17:05:14Z","modified":"2026-06-08T23:45:14.633172068Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"high"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:46:42.78452Z"}]}}