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CVE-2026-41427

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict client registration were not actually restricted — any authenticated user could reach the create endpoints and register an OAuth client with attacker-chosen redirect URIs and metadata. This vulnerabilit
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:30df9b61f44216cffaba426f9761eabda9cc85896d845fc061e16b95b092faad
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"oauth-provider","vendor":"better-auth","versions":[{"status":"affected","version":">= 1.4.8-beta.7, < 1.6.5"},{"status":"affected","version":">= 1.7.0-beta.0, <= 1.7.0-beta.1"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:fd8d3dc2b9140478ca3458f52bc4ae5777266f976445aebb750fc3612744b9c0 · sha256:d91615b1e46cb6ed… · /containers/cna/affected/1

{"product":"better-auth","vendor":"better-auth","versions":[{"status":"affected","version":">= 1.4.8-beta.7, < 1.6.5"},{"status":"affected","version":">= 1.7.0-beta.0, <= 1.7.0-beta.1"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:fd8d3dc2b9140478ca3458f52bc4ae5777266f976445aebb750fc3612744b9c0 · sha256:d91615b1e46cb6ed… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"product":"oauth-provider","vendor":"better-auth","versions":[{"status":"affected","version":">= 1.4.8-beta.7, < 1.6.5"},{"status":"affected","version":">= 1.7.0-beta.0, <= 1.7.0-beta.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:fd8d3dc2b9140478ca3458f52bc4ae5777266f976445aebb750fc3612744b9c0 · sha256:d91615b1e46cb6ed… · /containers/cna/affected/1
{"product":"better-auth","vendor":"better-auth","versions":[{"status":"affected","version":">= 1.4.8-beta.7, < 1.6.5"},{"status":"affected","version":">= 1.7.0-beta.0, <= 1.7.0-beta.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:fd8d3dc2b9140478ca3458f52bc4ae5777266f976445aebb750fc3612744b9c0 · sha256:d91615b1e46cb6ed… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.1,"baseSeverity":"HIGH","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:fd8d3dc2b9140478ca3458f52bc4ae5777266f976445aebb750fc3612744b9c0 · sha256:d91615b1e46cb6ed… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fd8d3dc2b9140478ca3458f52bc4ae5777266f976445aebb750fc3612744b9c0 · sha256:d91615b1e46cb6ed… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/better-auth/better-auth/security/advisories/GHSA-xr8f-h2gw-9xh6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-xr8f-h2gw-9xh6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fd8d3dc2b9140478ca3458f52bc4ae5777266f976445aebb750fc3612744b9c0 · sha256:d91615b1e46cb6ed… · /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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