OAuth Single Sign On – SSO (OAuth Client) vulnerabilities

The OAuth Single Sign On – SSO (OAuth Client) plugin in versions up to and including 7.1.2 contains an unauthenticated bypass vulnerability. An attacker does not need prior authentication to exploit this flaw.

The OAuth Single Sign On - SSO (OAuth Client) plugin for WordPress contains an authentication bypass vulnerability via an alternate path or channel, allowing password recovery exploitation. This issue affects versions up to and including 38.5.8.

The OAuth Single Sign On – SSO (OAuth Client) plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 6.26.12. This is due to using a predictable state parameter (base64 encoded app name) without any randomness in the OAuth flow. This makes it possible for unauthenticated attackers to forge OAuth authorization requests and potentially hijack the OAuth flow via a forged request, granted they can trick a site administrator into performing an action such as clicking on a link.