CVE-2026-41213— @node-oauth/oauth2-server: PKCE code_verifier ABNF not enforced in token exchange allows brute-force redemption of intercepted authorization codes
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I. Basic Information for CVE-2026-41213
Vulnerability Information
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Vulnerability Title
@node-oauth/oauth2-server: PKCE code_verifier ABNF not enforced in token exchange allows brute-force redemption of intercepted authorization codes
Source: NVD (National Vulnerability Database)
Vulnerability 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 (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
过多认证尝试的限制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
@node-oauth/oauth2-server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
@node-oauth/oauth2-server是node-oauth开源的一个符合RFC标准的Node.js OAuth2服务器实现模块。 @node-oauth/oauth2-server存在安全漏洞，该漏洞源于token交换路径接受RFC7636无效的code_verifier值，可能导致暴力破解攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| node-oauth | node-oauth2-server | < 5.3.0 | - |
II. Public POCs for CVE-2026-41213
| # | POC Description | Source Link | Shenlong Link |
|---|
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V. Comments for CVE-2026-41213
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