CVE-2026-41070

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Source
https://cve.org/CVERecord?id=CVE-2026-41070
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41070.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-41070
Aliases
Downstream
Published
2026-05-08T15:14:46.186Z
Modified
2026-07-08T08:13:20.322070601Z
Severity
  • 10.0 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N CVSS Calculator
Summary
openvpn-auth-oauth2 returns FUNC_SUCCESS on client-deny, allowing unauthenticated VPN access
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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41070.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-287"
    ]
}
References

Affected packages

Git / github.com/jkroepke/openvpn-auth-oauth2

Affected ranges

Type
GIT
Repo
https://github.com/jkroepke/openvpn-auth-oauth2
Events
Introduced
24b3bc728995a59dde29c8e02bb1f74b31318f09
Fixed
4d6b317632a89dcfdfa727e83348f1fcd98002e0
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "1.26.3"
        },
        {
            "fixed": "1.27.3"
        }
    ]
}

Affected versions

v1.*
v1.26.3
v1.26.4
v1.27.0
v1.27.1
v1.27.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41070.json"