CVE-2026-41070
CRITICAL SEVERITYCVSS Score & Metrics
Base Score
10.0 / 10
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
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.
Vulnerability Details
Published Date
Last Modified
CWE ID
CWE-287
Source
GitHub
Vendor
go
Product
github.com/jkroepke/openvpn-auth-oauth2
External References
- https://github.com/jkroepke/openvpn-auth-oauth2/security/advisories/GHSA-246w-jgmq-88fg
- https://github.com/jkroepke/openvpn-auth-oauth2/pull/829
- https://github.com/jkroepke/openvpn-auth-oauth2/commit/36f69a6c67c1054da7cbfa04ced3f0555127c8f2
- https://github.com/OpenVPN/openvpn/blob/master/include/openvpn-plugin.h.in
- https://github.com/OpenVPN/openvpn3/blob/master/doc/webauth.md
- https://github.com/jkroepke/openvpn-auth-oauth2/releases/tag/v1.27.3
- https://github.com/advisories/GHSA-246w-jgmq-88fg
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