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CVE-2026-53513

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: true is set, store them on the ssoProvider row without origin validation, and fetch them during OIDC callback, allowing non-blind server-side request forgery and possible account linking when trustEmailVeri
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:fd6f6bb2b68a064d1bce3ab0ab83972158341a0d0365aa2541ce9a883f7b1866
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"sso","vendor":"@better-auth","versions":[{"status":"affected","version":">= 0.1.0, < 1.6.11"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/affected/1

{"product":"better-auth","vendor":"better-auth","versions":[{"status":"affected","version":">= 0.1.0, < 1.6.11"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/affected/0
cwe · 4 assertions

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /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:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/problemTypes/3/descriptions/0

{"cweId":"CWE-441","description":"CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/problemTypes/2/descriptions/0

Affected products and versions

2 source assertions
{"product":"sso","vendor":"@better-auth","versions":[{"status":"affected","version":">= 0.1.0, < 1.6.11"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/affected/1
{"product":"better-auth","vendor":"better-auth","versions":[{"status":"affected","version":">= 0.1.0, < 1.6.11"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.6,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

4 source assertions
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /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:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/problemTypes/3/descriptions/0
{"cweId":"CWE-441","description":"CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/problemTypes/2/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/better-auth/better-auth/commit/37f60cb176cb53147da7dfd5ec15afa5b486e81e","tags":["x_refsource_MISC"],"url":"https://github.com/better-auth/better-auth/commit/37f60cb176cb53147da7dfd5ec15afa5b486e81e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/references/2
{"name":"https://github.com/better-auth/better-auth/pull/9574","tags":["x_refsource_MISC"],"url":"https://github.com/better-auth/better-auth/pull/9574"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /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:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /containers/cna/references/3
{"name":"https://github.com/better-auth/better-auth/security/advisories/GHSA-5rr4-8452-hf4v","tags":["x_refsource_CONFIRM"],"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-5rr4-8452-hf4v"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a9da918856861334012215cf218e7e08856ce9b92d089ca72007f183b526da3d · sha256:69d23ace7e73f60b… · /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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