## better-auth: OAuth Proxy lets an attacker sign in as another user

- 種別: advisory
- 重大度: high
- 関連技術: nodejs
- 公開日時: 2026-10-27T15:32:16.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-r4xp-prcw-77qf)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-r4xp-prcw-77qf

影響: npm:better-auth >= 1.5.0-beta.12, < 1.7.7 → 1.7.7
Am I affected? You may be affected if you use better-auth from 1.5.0-beta.12 through versions before 1.7.7 with the OAuth Proxy plugin. You are affected only if all of these are also true: - On a participating environment, the OAuth Proxy plugin has no dedicated secret, or its secret equals that environment's global Better Auth secret. - Sign-in state is stored in a cookie (account.storeStateStrategy: "cookie"). With a database or secondary storage, this is only the case if you chose it explici…