CVE-2026-41070
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.
How to fix
- github.com/jkroepke/openvpn-auth-oauth21.27.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/jkroepke/openvpn-auth-oauth2Go | 1.26.3 ≤ v < 1.27.3 | 1.27.3 |
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