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CVE-2026-53516

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:bb121c55591e644bf39041e39b33da4a5ecd2eb63c46d8cec48a6c3ef95f4b74
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:78069ee6edf506e9c22dc41402f0e02b5e5b09346d7dff70ed928fe1ec77b10d · sha256:e54eb7c91d2546fb… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:78069ee6edf506e9c22dc41402f0e02b5e5b09346d7dff70ed928fe1ec77b10d · sha256:e54eb7c91d2546fb… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"better-auth","vendor":"better-auth","versions":[{"status":"affected","version":"< 1.6.11"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:78069ee6edf506e9c22dc41402f0e02b5e5b09346d7dff70ed928fe1ec77b10d · sha256:e54eb7c91d2546fb… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":8.3,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:78069ee6edf506e9c22dc41402f0e02b5e5b09346d7dff70ed928fe1ec77b10d · sha256:e54eb7c91d2546fb… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:78069ee6edf506e9c22dc41402f0e02b5e5b09346d7dff70ed928fe1ec77b10d · sha256:e54eb7c91d2546fb… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:78069ee6edf506e9c22dc41402f0e02b5e5b09346d7dff70ed928fe1ec77b10d · sha256:e54eb7c91d2546fb… · /containers/cna/problemTypes/1/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/better-auth/better-auth/commit/da7e50beee849c59a2ed1ec6b3a38cc6ab9fb563","tags":["x_refsource_MISC"],"url":"https://github.com/better-auth/better-auth/commit/da7e50beee849c59a2ed1ec6b3a38cc6ab9fb563"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78069ee6edf506e9c22dc41402f0e02b5e5b09346d7dff70ed928fe1ec77b10d · sha256:e54eb7c91d2546fb… · /containers/cna/references/2
{"name":"https://github.com/better-auth/better-auth/pull/9578","tags":["x_refsource_MISC"],"url":"https://github.com/better-auth/better-auth/pull/9578"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78069ee6edf506e9c22dc41402f0e02b5e5b09346d7dff70ed928fe1ec77b10d · sha256:e54eb7c91d2546fb… · /containers/cna/references/1
{"name":"https://github.com/better-auth/better-auth/releases/tag/v1.6.11","tags":["x_refsource_MISC"],"url":"https://github.com/better-auth/better-auth/releases/tag/v1.6.11"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78069ee6edf506e9c22dc41402f0e02b5e5b09346d7dff70ed928fe1ec77b10d · sha256:e54eb7c91d2546fb… · /containers/cna/references/3
{"name":"https://github.com/better-auth/better-auth/security/advisories/GHSA-g38m-r43w-p2q7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-g38m-r43w-p2q7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78069ee6edf506e9c22dc41402f0e02b5e5b09346d7dff70ed928fe1ec77b10d · sha256:e54eb7c91d2546fb… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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