CVE-2026-53516

HIGHPre-NVD 8.38.3
EchelonGraph scoreLOW confidence

This high-severity CVE scores 8.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: secondary
8.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 8.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.3
EG Score
8.3(low)
EPSS
—
KEV
Not listed

Published

July 7, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jul 15, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

core: pre-account hijacking via OAuth implicit linking (nOAuth-class) · Advisory · better-auth/better-auth · GitHub

https://github.com/better-auth/better-auth/security/advisories/GHSA-g38m-r43w-p2q7
github_release Patch Available

v1.6.11

Patch available: better-auth/better-auth v1.6.11

https://github.com/better-auth/better-auth/releases/tag/v1.6.11
github_pr

fix(oauth): block OAuth linking to unverified local accounts

Fix merged in better-auth/better-auth PR #9578 on 2026-05-12 — awaiting tagged release

https://github.com/better-auth/better-auth/pull/9578
github_commit

commit da7e50beee84 (better-auth/better-auth)

Fix landed in better-auth/better-auth commit da7e50beee84 — awaiting tagged release

https://github.com/better-auth/better-auth/commit/da7e50beee849c59a2ed1ec6b3a38cc6ab9fb563

Vendor Advisories for CVE-2026-53516(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 18× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-16 00:52 UTCEG score recompute
  2. 2026-07-15 13:23 UTCEG score recompute
  3. 2026-07-15 01:50 UTCEG score recompute
  4. 2026-07-14 14:21 UTCEG score recompute
  5. 2026-07-14 02:51 UTCEG score recompute
  6. 2026-07-13 15:21 UTCEG score recompute
  7. 2026-07-13 03:50 UTCEG score recompute
  8. 2026-07-12 16:20 UTCEG score recompute
  9. 2026-07-12 04:50 UTCEG score recompute
  10. 2026-07-11 17:20 UTCEG score recompute
  11. 2026-07-11 05:50 UTCEG score recompute
  12. 2026-07-10 18:20 UTCEG score recompute
  13. 2026-07-10 06:49 UTCEG score recompute
  14. 2026-07-09 19:17 UTCEG score recompute
  15. 2026-07-09 07:47 UTCEG score recompute
  16. 2026-07-08 20:18 UTCEG score recompute
  17. 2026-07-08 08:46 UTCEG score recompute
  18. 2026-07-07 21:13 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2026-53516?
CVE-2026-53516 is a high vulnerability published on July 7, 2026. 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…
When was CVE-2026-53516 disclosed?
CVE-2026-53516 was first published in the National Vulnerability Database on July 7, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-53516?
CVE-2026-53516 has a CVSS v3 base score of 8.3 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-53516?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53516, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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