{"id":"CVE-2026-121802","state":"PUBLISHED","title":"@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 va","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.","publishedAt":"2026-11-04T02:36:13.640Z","updatedAt":"2026-11-04T02:44:07.935Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","source":"mitre"},"assigner":"mitre","products":["better-auth Better Auth"],"affected":[{"vendor":"better-auth","product":"Better Auth","packageURL":"pkg:npm/%40better-auth/expo","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.7.16","versionType":"semver"}]}],"references":["https://github.com/better-auth/better-auth/security/advisories/GHSA-4wq4-2ppv-q3hg","https://github.com/better-auth/better-auth/blob/main/packages/expo/CHANGELOG.md","https://github.com/better-auth/better-auth/releases/tag/v1.7.16"],"weaknesses":["CWE-346"],"ingestedAt":"2026-11-04T02:50:06.129Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/121xxx/CVE-2026-121802.json","commit":"39775b588bd54ab1c63be24aeedff2989fa3c7d8","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-121802","state":"PUBLISHED","datePublished":"2026-11-04T02:36:13.640Z","dateUpdated":"2026-11-04T02:44:07.935Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2026-11-04T02:36:12.694Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"@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."}],"affected":[{"vendor":"better-auth","product":"Better Auth","packageURL":"pkg:npm/%40better-auth/expo","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.7.16","versionType":"semver"}]}],"references":[{"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-4wq4-2ppv-q3hg"},{"url":"https://github.com/better-auth/better-auth/blob/main/packages/expo/CHANGELOG.md"},{"url":"https://github.com/better-auth/better-auth/releases/tag/v1.7.16"}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-346","description":"CWE-346 Origin Validation Error","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"mitre","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateUpdated":"2026-11-04T02:44:07.935Z"},"x_generator":{"engine":"CVE-Request-form 0.0.1"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:*:*:*","versionEndExcluding":"1.7.16"}]}]}]}}}}