Enterprise Single Sign-On - CAS provides a friendly open source community that actively supports and contributes to the project. While the project is rooted in higher-ed open source, it has grown to an international audience spanning Fortune 500 companies and small special-purpose installations.

CAS provides enterprise single sign-on service for the Web:

  • An open and well-documented protocol
  • An open-source Java server component
  • Pluggable authentication support (LDAP, database, X.509, 2-factor)
  • Support for multiple protocols (CAS, SAML, OAuth, OpenID)
  • A library of clients for Java, .Net, PHP, Perl, Apache, uPortal, and others
  • Integrates with uPortal, BlueSocket, TikiWiki, Mule, Liferay, Moodle and others
  • Community documentation and implementation support
  • An extensive community of adopters


CAS Documentation

CAS Issue Tracker

Milestones and Roadmap



CAS v6.5.0-RC5

February 1, 2022

CAS v6.5.0-RC2 Release

Announced November 11, 2021

CAS 6.5.0 RC1 is Released

Announced October 11, 2021

CAS v6.4.0 Release

The CAS community is pleased to announce the release of CAS v6.4.0. 

Take Out a CAS Supporting Subscription!

CAS requires a consistent and sustainable source of funding to keep commitments to release and maintenance schedules. This is why we are now asking the larger majority of the user community to consider supporting and sponsoring the development effort financially via a CAS supporting subscription and Apereo Foundation membership.

CAS 6.1.0 RC3 Feature Release

The official CAS 6.0.0 GA was released on December 28th, 2018.

Apereo CAS v. 4.2.1 Release

The Apereo CAS server version 4.2.1 is released.

Apereo CAS v. 4.1.8 Release

The Apereo CAS server version 4.1.8 is released.

Apereo CAS v. 4.1.0 Release

We welcome all CAS adopters to upgrade to this brand new release.

CAS 4.0.1 Release

The release includes many bug fixes, improvements and new features.

CAS 3.5.3 Release

The CAS development team is pleased to announce the release of CAS 3.5.3. This release includes several bug fixes. 

Serbo-Croatian Translation of CAS Protocol

We are pleased to announce that we have Serbo-Croatian translation of the CAS Protocol documentation.

CAS Server 3.4.11 Release

The CAS development team is pleased to announce the release of 3.4.11.

CAS Server 3.4.10 (and 3.4.9) released

We're pleased to announce both CAS Server 3.4.9 and CAS Server 3.4.10.

Archive: Jasig CAS Documentation Initiative

2010 discussion of CAS documentation initiative.