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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/jkroepke/openvpn-auth-oauth2Go | >= 1.26.3, < 1.27.3 | 1.27.3 |
Affected products
2- Range: >= 1.26.3, < 1.27.3
Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-246w-jgmq-88fgghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-41070ghsaADVISORY
- github.com/OpenVPN/openvpn/blob/master/include/openvpn-plugin.h.inghsaWEB
- github.com/OpenVPN/openvpn3/blob/master/doc/webauth.mdghsaWEB
- github.com/jkroepke/openvpn-auth-oauth2/commit/36f69a6c67c1054da7cbfa04ced3f0555127c8f2nvdWEB
- github.com/jkroepke/openvpn-auth-oauth2/pull/829ghsaWEB
- github.com/jkroepke/openvpn-auth-oauth2/releases/tag/v1.27.3ghsaWEB
- github.com/jkroepke/openvpn-auth-oauth2/security/advisories/GHSA-246w-jgmq-88fgnvdWEB
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