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CVE-2026-41070— openvpn-auth-oauth2 returns FUNC_SUCCESS on client-deny, allowing unauthenticated VPN access

CVSS 10.0 · Critical EPSS 0.04% · P13
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I. Basic Information for CVE-2026-41070

Vulnerability Information
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Vulnerability Title
openvpn-auth-oauth2 returns FUNC_SUCCESS on client-deny, allowing unauthenticated VPN access
Source: NVD (National Vulnerability Database)
Vulnerability Description
openvpn-auth-oauth2 is a plugin/management interface client for OpenVPN server to handle an OIDC based single sign-on (SSO) auth flows. From version 1.26.3 to before version 1.27.3, when openvpn-auth-oauth2 is deployed in the experimental plugin mode (shared library loaded by OpenVPN via the plugin directive), clients that do not support WebAuth/SSO (e.g., the openvpn CLI on Linux) are incorrectly admitted to the VPN despite being denied by the authentication logic. The default management-interface mode is not affected because it does not use the OpenVPN plugin return-code mechanism. This issue has been patched in version 1.27.3.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
openvpn-auth-oauth2 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
openvpn-auth-oauth2是Jan-Otto Kröpke个人开发者的一款单点登录认证集成工具。 openvpn-auth-oauth2 1.26.3版本至1.27.3之前版本存在授权问题漏洞，该漏洞源于实验性插件模式下客户端未支持WebAuth/SSO时被错误接纳，可能导致绕过身份验证逻辑。
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

VendorProductAffected VersionsCPESubscribe
jkroepkeopenvpn-auth-oauth2 >= 1.26.3, < 1.27.3 -

II. Public POCs for CVE-2026-41070

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III. Intelligence Information for CVE-2026-41070

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IV. Related Vulnerabilities

Same weakness: CWE-287

V. Comments for CVE-2026-41070

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