Node-oauth vulnerabilities

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Published CVEs affecting Node-oauth products: 1 record(s), with severity, exploitation and fixes.

Node-oauth/oauth2-server 1 Node-oauth2-server 1

Exploited only (KEV) →

CVE-2026-41213 Medium · 5.9 CWE-307 Apr 23, 2026

@node-oauth/oauth2-server: PKCE code_verifier ABNF not enforced in token exchange allows brute-force redemption of intercepted authorization codes

@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.