Quote

"Every citizen shall have the right and the opportunity, without any of the distinctions mentioned in article 2 and without unreasonable restrictions: (b) To vote and to be elected at genuine periodic elections which shall be by universal and equal suffrage and shall be held by secret ballot, guaranteeing the free expression of the will of the electors."

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UNGA: International Covenant on Civil and Political Rights, art. 25(b)

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International Covenant on Civil and Political Rights

Summaries

Limits on the right to vote may be based on citizenship.
Limits on individuals wishing to run for office may only be based on objective and reasonable criteria, including citizenship.