CEVAP:

The immunities and privileges of the international organizations are based on the following:

• Their constitutions, for example Article 19 of the ICJ and Article 105 of the UN Charter;
• Agreement with the host country such as the Headquarters Agreement between the UN and the US;
• A multilateral treaty such as the 1946 General Convention on the Privileges and Immunities of the United Nations;
• Domestic legislation of the host country The extent of these immunities also depends on the above sources