CVEvulnerability

CVE-2026-41213

5.9 MEDIUM Published 2026-04-23 Modified 2026-10-26 Official page ↗
Status
Analyzed
Published
2026-04-23
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-1289, CWE-307

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.

Affected configurations

• node-oauth node-oauth\/oauth2-server (< 5.3.0)

Related

Weakness · CWE (2)

  • CWE-1289 Improper Validation of Unsafe Equivalence in Input weakness
  • CWE-307 Improper Restriction of Excessive Authentication Attempts weakness

References