CVE-2026-41213

@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.

• CWE-307
• CWE-1289

• https://github.com/node-oauth/node-oauth2-server/security/advisories/GHSA-jhm7-29pj-4xvfExploit, Mitigation, Vendor Advisory
• https://github.com/node-oauth/node-oauth2-server/security/advisories/GHSA-jhm7-29pj-4xvfExploit, Mitigation, Vendor Advisory

Published

Apr 23, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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