Authenticating with a SSL Client Certificate by using the email address. Optionally, new accounts can be created with the name from the certificate.
As of April 2026, Client Certificate Authentication is a WordPress ssl plugin with 10 active installations and a 5/5 rating from 2 reviews. It has been downloaded 3.2K+ times in total. Requires WordPress 3.1+ and PHP false+. Available on WordPress.org since 2013. Last updated 12 years ago — may have compatibility concerns. Top alternative: Cloudflare.
The Client Certificate Authentication plugin enables WordPress to login a user with a SSL client certificate. The plugin uses the email address from the subject field to identify the user by the email address of his wordpress account. Optionally, new accounts can be created on the fly by using email address and name from the certificate. By limiting login and registration to users providing a client certificate, bots are locked out and spam is eliminated.
Acknowledgements: This plugin is based on the HTTP Authentication plugin by Daniel Westermann-Clark. Ideas taken from Dan B.’s implementation for client certificate authentication.
| WordPress | 3.1+ requiredTested up to 3.5.2 |
| PHP | false+ required |
Initial release.
Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.