CVE-2026-53516: Better Auth is an authentication and authorization library for TypeScript

Routine

HIGH 8.3UPGRADE

CVE-2026-53516 is a high-severity flaw (CVSS 8.3) affecting better auth. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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'

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-287, CWE-345
Published	2026-07-15
Last modified	2026-07-21

Publisher (CNA): GitHub, Inc. · Vendor: better-auth

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-15 18:16 UTCPublished CVE record published
2026-07-21 14:14 UTCUpdated Record last modified

better-auth better auth UPGRADE

Affected: < 1.6.11

Fixed in: 1.6.11

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls better-auth

2. UPGRADE to 1.6.11

npm install better-auth@">=1.6.11"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-53516?

better auth: upgrade to 1.6.11. Exact commands for each OS are on this page.

Is CVE-2026-53516 being exploited?

CVE-2026-53516 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-53516 affect?

CVE-2026-53516 affects better auth. Severity is high (CVSS 8.3). 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:

How urgent is CVE-2026-53516?

Priority 34/100. High severity

Related CVEs

CVE-2026-53518 HIGH 8.1 UPGRADE UPGRADE Better Auth is an authentication and authorization library for TypeScript
CVE-2026-53517 HIGH 8.1 UPGRADE UPGRADE Better Auth is an authentication and authorization library for TypeScript
CVE-2026-53513 CRITICAL 9.6 UPGRADE UPGRADE Better Auth is an authentication and authorization library for TypeScript
CVE-2026-53515 HIGH 7.1 UPGRADE UPGRADE Better Auth is an authentication and authorization library for TypeScript
CVE-2026-53514 HIGH 7.7 UPGRADE Better Auth is an authentication and authorization library for TypeScript

References

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