[@feathersjs/authentication-oauth] Feathers has an open redirect in OAuth callback enables account takeover

**[@feathersjs/authentication-oauth] Feathers has an open redirect in OAuth callback enables account takeover**

Description The redirect query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them. The application constructs the final redirect URL by concatenating the base origin with the user-supplied redirect parameter: // https://github.com/feathersjs/feathers/blob/dove/packages/authentication-oauth/src/service.ts#L158C3-L176C4 const { redirect } = query; ... session.redirect = redirect; // https://github.com/feathersjs/feathers/blob/dove/packages/authentication-oauth/src/strategy.ts#L98 const redirectUrl = `${redirect}${queryRedirect}`; Where: redirect = base origin from config (e.g., https://target.com) queryRedirect = user input from ?redirect= parameter This is exploitable when the origins array is configured and origin values do not end with /. An attacker can supply @attacker.com as the redirect value results in https://target.com@attacker.com#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover...

---

**[devsupporter 해설]**

이 기사는 GitHub Security Advisories에서 제공하는 최신 개발 동향입니다. 관련 도구나 기술에 대해 더 알아보시려면 원본 링크를 참고하세요.