Description
@node-oauth/oauth2-server is a module for implementing an OAuth2 server in Node.js. The token exchange path accepts RFC7636-invalid code_verifier values (including one-character strings) for S256 PKCE flows. Because short/weak verifiers are accepted and failed verifier attempts do not consume the authorization code, an attacker who intercepts an authorization code can brute-force code_verifier guesses online until token issuance succeeds.
Problem types
CWE-307: Improper Restriction of Excessive Authentication Attempts
CWE-1289: Improper Validation of Unsafe Equivalence in Input
Product status
References
github.com/...server/security/advisories/GHSA-jhm7-29pj-4xvf
github.com/...server/security/advisories/GHSA-jhm7-29pj-4xvf