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Best central authentication service plugins for WordPress

The most popular central authentication service plugins for WordPress in November 2026, in WordPress.org’s own popular order, which follows active installs. wpCAS leads with 100+ active installs, ahead of Cassava CAS Server (30+) and UTHSC WPCAS (10+). All 4 plugins tagged “central authentication service” are below, with figures from WordPress.org that update every day.

Installs aren’t everything: a recent release, a “Tested up to” that matches the current WordPress, and support threads that get resolved show a plugin is looked after. Open any plugin for its downloads, rank history and alternatives.

Research this niche or see all plugins.

Top 4 central authentication service plugins

  1. 1.
    wpCAS

    The most installed central authentication service plugin, with 100+ active installs. No reviews yet, last updated 16 years ago. Tested only up to WordPress 2.7.1.

  2. 2.
    Cassava CAS Server

    30+ active installs. Only 2 reviews so far, last updated 10 years ago. Tested only up to WordPress 4.4.34.

  3. 3.
    UTHSC WPCAS

    10+ active installs. No reviews yet, last updated 10 years ago. Tested only up to WordPress 4.3.34.

  4. 4.
    wpCAS Server

    10+ active installs. No reviews yet, last updated 14 years ago. Tested only up to WordPress 2.9.2.

All 4 plugins tagged “central authentication service”