ElggElgg 2.3.1 (changelog) is the latest and recommended version of Elgg.
Elgg 1.12.15 (changelog) is the recommended release if using Elgg 1.12
Elgg 2.2, 2.1, 2.0, 1.11, and 1.10 are receiving only security updates.
These versions of Elgg are no longer supported:
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Security issues should be reported to firstname.lastname@example.org!