Improper Authentication Affecting github.com/jkroepke/openvpn-auth-oauth2/lib/openvpn-auth-oauth2/openvpn package, versions >=1.26.3 <1.27.3
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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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMJKROEPKEOPENVPNAUTHOAUTH2LIBOPENVPNAUTHOAUTH2OPENVPN-16414784
- published4 May 2026
- disclosed22 Apr 2026
- creditkkalev
Introduced: 22 Apr 2026
CVE-2026-41070 (opens in a new tab)How to fix?
Upgrade github.com/jkroepke/openvpn-auth-oauth2/lib/openvpn-auth-oauth2/openvpn to version 1.27.3 or higher.
Overview
Affected versions of this package are vulnerable to Improper Authentication in the handleAuthUserPassVerify process when deployed in experimental plugin mode. An attacker can gain unauthorized VPN access by connecting with a client that does not advertise WebAuth/SSO support, thereby bypassing authentication and obtaining full network access. This is only exploitable if the deployment is running in experimental plugin mode and not in the default management-interface mode.
Workaround
This vulnerability can be mitigated by switching to standalone management client mode or restricting VPN access at the network level to only clients known to support WebAuth/SSO.