Improper Authentication

openvpn-auth-oauth2 is vulnerable to Improper Authentication. The vulnerability is due to improper handling of authentication logic in experimental plugin mode, which allows unsupported clients to bypass authentication checks and gain unauthorized VPN access...

CVE-2026-41070

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...

CVE-2026-41070

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...

openvpn-auth-oauth2 授权问题漏洞

OpenVPN-Auth-OAuth2 is a single-signpoint login authentication integration tool developed by Jan-Otto Kröpke. In versions 1.26.3 to 1.27.3 of OpenVPN-Auth-OAuth2, there were authorization-related vulnerabilities. These vulnerabilities occurred when clients did not support WebAuth/SSO in...

GHSA-246W-JGMQ-88FG openvpn-auth-oauth2 returns FUNC_SUCCESS on client-deny, allowing unauthenticated VPN access

Summary 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...

openvpn-auth-oauth2 returns FUNC_SUCCESS on client-deny, allowing unauthenticated VPN access

Summary 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...

Improper Authentication

Overview Affected versions of this package are vulnerable to Improper Authentication in the handleAuthUserPassVerify process when deployed in experimental plugin mode. An attacker can gain unauthorized VPN access by connecting with a client that does not advertise WebAuth/SSO support, thereby...

PT-2026-34452

Name of the Vulnerable Software and Affected Versions openvpn-auth-oauth2 versions 1.26.3 through 1.27.2 Description An authentication bypass exists when the software is deployed in experimental plugin mode. Clients that do not support WebAuth/SSO are incorrectly granted full network access witho...

PT-2026-34525

Summary 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...