Shibboleth allows users to securely send trusted information about themselves to remote resources. This information may then be used for authentication, authorization, content personalization, and enabling single sign-on across a broad range of services from many different providers.
The of the Service Provider(SP) is 2.6.0. There are no at this time. Earlier releases should be presumed unsupported, but you can try. Identity Provider(IdP) v2.x is formally unsupported. SP v2.x is fully interoperable with IdP v3.x and modern v2.x releases and partially interoperable with older versions.
The minimum safe release of the SP is v2.6.0. You must also ensure various libraries are also sufficiently new. If you are running versions prior to these, you should upgrade immediately or take steps to protect your system by reviewing the advisories. In all cases, there may be important security issues affecting any versions other than the latest ones and you should always review the advisories to ensure you understand whether your particular system might be affected. The current stable releaseof the Identity Provider is 3.2.1, which has a new documentation space. The Centralized Discovery Service is also EOL.
All software, including archived releases, is available from http://shibboleth.net/downloads/ and each release is accompanied by a detached PGP signature using one of the keys listed in the project's KEYS file. High-level information to get started with SAML and Shibboleth can be found in the wiki space.
All deployers should make sure to subscribe to to the
announce mailing list to be sure of seeing important security announcements.