{"cve":"CVE-2026-53516","nvd":{"published":"2026-07-15T18:16:47.967","modified":"2026-07-21T14:14:22.307","status":"Analyzed","description":"Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, Better Auth's OAuth callback auto-link gate in handleOAuthUserInfo accepts implicit account linking when the OAuth provider asserts email_verified: true without requiring the local user row's emailVerified field to also be true, allowing an attacker who pre-registers a victim email through /sign-up/email to bind the victim's OAuth identity to the attacker's account. The same primitive affects one-tap, and emailAndPassword.requireEmailVerification: true does not mitigate the link-time verification change. This issue is fixed in version 1.6.11.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L","score":8.3},"cwes":["CWE-287","CWE-345"],"references":["https://github.com/better-auth/better-auth/commit/da7e50beee849c59a2ed1ec6b3a38cc6ab9fb563","https://github.com/better-auth/better-auth/pull/9578","https://github.com/better-auth/better-auth/releases/tag/v1.6.11","https://github.com/better-auth/better-auth/security/advisories/GHSA-g38m-r43w-p2q7"],"products":["better-auth:better_auth"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-53516","score":0.00289,"percentile":0.21498,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-g38m-r43w-p2q7","url":"https://osv.dev/vulnerability/GHSA-g38m-r43w-p2q7","summary":"Better Auth has an account takeover issue via OAuth auto-link to unverified pre-registered email","modified":"2026-07-20T19:30:23.992960910Z","packages":[{"ecosystem":"npm","name":"better-auth","purl":"pkg:npm/better-auth","ranges":["<1.6.11"],"fixed":["1.6.11"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}