CVE-2025-61928: Better Auth: Unauthenticated API key creation through api-key plugin

October 9, 2025 (updated December 9, 2025)

A critical authentication bypass was identified in the API key creation and update endpoints. An attacker could create or modify API keys for arbitrary users by supplying a victim’s user ID in the request body. Due to a flaw in how the authenticated user was derived, the endpoints could treat attacker-controlled input as an authenticated user object under certain conditions.

References

github.com/advisories/GHSA-99h5-pjcv-gr6v
github.com/better-auth/better-auth
github.com/better-auth/better-auth/commit/556085067609c508f8c546ceef9003ee8c607d39
github.com/better-auth/better-auth/security/advisories/GHSA-99h5-pjcv-gr6v
nvd.nist.gov/vuln/detail/CVE-2025-61928

Code Behaviors & Features

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