Improper Authentication Affecting openvpn-auth-oauth2 package, versions <1.27.3-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-OPENVPNAUTHOAUTH2-16638694
- published11 May 2026
- disclosed8 May 2026
Introduced: 8 May 2026
CVE-2026-41070 (opens in a new tab)How to fix?
Upgrade Debian:unstable openvpn-auth-oauth2 to version 1.27.3-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openvpn-auth-oauth2 package and not the openvpn-auth-oauth2 package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.