{"id":"CVE-2026-121802","aliases":["EUVD-2026-116694","GHSA-4wq4-2ppv-q3hg","GHSA-hv45-wgqh-c9j5"],"status":"published","title":"@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated...","description":"@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated changes of any account's email address), because it signs a caller-supplied state value without checking whether that value had been issued by the server. NOTE: the application secret must be rotated after updating to a fixed version.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00203,"percentile":0.10394,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-346"],"published":"2026-11-04T02:36:13Z","modified":"2026-11-05T03:31:10Z","products":[{"vendor":"better-auth","product":"better auth"}],"references":[{"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-4wq4-2ppv-q3hg","tags":["advisory"]},{"url":"https://github.com/better-auth/better-auth/blob/main/packages/expo/CHANGELOG.md","tags":["web"]},{"url":"https://github.com/better-auth/better-auth/releases/tag/v1.7.16","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121802","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-hv45-wgqh-c9j5"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121802.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-121802","description":"@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated changes of any account's email address), because it signs a caller-supplied state value without checking whether that value had been issued by the server. NOTE: the application secret must be rotated after updating to a fixed version.","status":"published","published":"2026-11-04T02:36:13.64Z","modified":"2026-11-06T18:45:40.015Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"cna"}],"cwes":["CWE-346"],"updated_at":"2026-11-06T19:59:19.701997Z"}],"euvd":[{"id":"EUVD-2026-116694","description":"@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated changes of any account's email address), because it signs a caller-supplied state value without checking whether that value had been issued by the server. NOTE: the application secret must be rotated after updating to a fixed version.","status":"published","published":"2026-11-04T02:36:13Z","modified":"2026-11-06T18:45:40Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-06T20:06:05.664912Z"}],"ghsa":[{"id":"GHSA-hv45-wgqh-c9j5","title":"@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated...","description":"@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated changes of any account's email address), because it signs a caller-supplied state value without checking whether that value had been issued by the server. NOTE: the application secret must be rotated after updating to a fixed version.","status":"published","published":"2026-11-04T03:32:29Z","modified":"2026-11-04T03:32:36Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-346"],"updated_at":"2026-11-04T03:52:55.316904Z"}],"nvd":[{"id":"CVE-2026-121802","description":"@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated changes of any account's email address), because it signs a caller-supplied state value without checking whether that value had been issued by the server. NOTE: the application secret must be rotated after updating to a fixed version.","status":"published","published":"2026-11-04T03:17:15.73Z","modified":"2026-11-06T19:17:43.42Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"secondary"}],"cwes":["CWE-346"],"updated_at":"2026-11-06T22:02:16.475328Z"}],"osv":[{"id":"CVE-2026-121802","description":"@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated changes of any account's email address), because it signs a caller-supplied state value without checking whether that value had been issued by the server. NOTE: the application secret must be rotated after updating to a fixed version.","status":"published","published":"2026-11-04T02:36:13.64Z","modified":"2026-11-08T10:45:29.098994249Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-346"],"updated_at":"2026-11-07T11:15:41.683306Z"}]}}