CVE-2026-41213

MediumCVSS 5.9/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-307 CWE-1289

Affected software

No affected versions have been published.

Timeline

Published: Apr 23, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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