CVE-2026-41213

5.9 MEDIUM

@node-oauth/oauth2-server is a module for implementing an OAuth2 server in Node.js

Published: 2026-04-23 · Last updated: 2026-06-02

Severity and scoring

CVSS: 5.9 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE: CWE-1289, CWE-307

Affected products

Vendor	Product
node-oauth	node-oauth\/oauth2-server

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-41213
[Vendor advisory]https://github.com/node-oauth/node-oauth2-server/security/advisories/GHSA-jhm7-29pj-4xvf
[Vendor advisory]https://github.com/node-oauth/node-oauth2-server/security/advisories/GHSA-jhm7-29pj-4xvf

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