CVE-2026-41070

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Source
https://cve.org/CVERecord?id=CVE-2026-41070
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-41070.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-41070
Aliases
Downstream
Related
Published
2026-05-08T15:14:46Z
Modified
2026-10-15T02:51:34Z
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 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-287"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41070.json"
}
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
Fixed
36f69a6c67c1054da7cbfa04ced3f0555127c8f2
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "1.26.3"
                },
                {
                    "fixed":  "1.27.3"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "36f69a6c67c1054da7cbfa04ced3f0555127c8f2"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

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/osv-test-cve-osv-conversion/osv-output/CVE-2026-41070.json"