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 current stable release of the Identity Provider is V2.4.0. There are no previous stable releases at this time.
The current stable release of the Service Provider is V2.5.3. There are no previous stable releases at this time.
The minimum safe release versions that don't contain critical security issues are V2.3.6 of the IdP and V2.5.2 of the SP (in the latter case, you must 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.
Shibboleth V1.3.x and earlier releases of the Identity Provider and Service Provider are unsupported. Shibboleth V2.x is fully interoperable with V1.3.x releases, and is partially interoperable with older versions.
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.
For high-level information to get started, please read Understanding Shibboleth.
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