CVE-2026-53516Better Auth: Account takeover via OAuth auto-link to unverified pre-registered email
- 8.3HighCVSS base score
- 0.29%Exploitation in 30 daysEPSS · top 78% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By GitHub_M
- 36 days later
· 36 days later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High8.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L |
| NVDNVD · Analyzed | 3.1 | High8.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L |
- EPSS (exploitation in 30 days)
- 0.29% · top 78% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.3.
Affected products
- affected < 1.6.11
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npmbetter-authGHSA-g38m-r43w-p2q7 (opens in a new tab)
References
References4
- https://github.com/better-auth/better-auth/security/advisories/GHSA-g38m-r43w-p2q7 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/better-auth/better-auth/pull/9578 (opens in a new tab)x_refsource_MISC
- https://github.com/better-auth/better-auth/commit/da7e50beee849c59a2ed1ec6b3a38cc6ab9fb563 (opens in a new tab)x_refsource_MISC
- https://github.com/better-auth/better-auth/releases/tag/v1.6.11 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-44732 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-g38m-r43w-p2q7 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-53516)Record last updated .