CABRI has a diverse membership base, consisting of 16 countries that have formally acceded to the international agreement. CABRI currently works with around 40 African countries. 

CABRI was established as an international organisation following the ratification of the international agreement by six founding member countries – Ghana, Kenya, Mali, Rwanda, Senegal and South Africa. 

In April 2010 the Republic of Mauritius became a member, followed by the Central African Republic in April 2011. In November 2011 the Kingdom of Lesotho joined CABRI, with Liberia and Burkina Faso becoming members in August 2013. The Gambia followed in December 2014, Côte d'Ivoire in April 2015 and the Republic of Guinea in May 2017. In 2018 CABRI welcomed two new members namely, the Federal Republic of Nigeria in January and Benin in March. 

All African countries are invited to become a member state of CABRI through accession to the international agreement according to their own domestic procedures.