CVE-2026-121802

Description

@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated changes of any account's email address), because it signs a caller-supplied state value without checking whether that value had been issued by the server. NOTE: the application secret must be rotated after updating to a fixed version.

Affected products

References

External links from the record. They lead to third-party sites.

• https://github.com/better-auth/better-auth/security/advisories/GHSA-4wq4-2ppv-q3hg
• https://github.com/better-auth/better-auth/blob/main/packages/expo/CHANGELOG.md
• https://github.com/better-auth/better-auth/releases/tag/v1.7.16