{"id":"UBUNTU-CVE-2026-41070","details":"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.","modified":"2026-07-02T18:02:59.134819792Z","published":"2026-05-08T16:16:00Z","upstream":["CVE-2026-41070"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-41070"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-41070"},{"type":"REPORT","url":"https://github.com/jkroepke/openvpn-auth-oauth2/security/advisories/GHSA-246w-jgmq-88fg"},{"type":"REPORT","url":"https://github.com/jkroepke/openvpn-auth-oauth2/commit/36f69a6c67c1054da7cbfa04ced3f0555127c8f2"},{"type":"REPORT","url":"https://github.com/jkroepke/openvpn-auth-oauth2/commit/36f69a6c67c1054da7cbfa04ced3f0555127c8f2"}],"affected":[{"package":{"name":"openvpn-auth-oauth2","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/openvpn-auth-oauth2?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.27.0-2","1.27.0-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"openvpn-auth-oauth2","binary_version":"1.27.0-2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41070.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}