Mortgage Rights constitute a security right over land that grants creditors preferential status and executorial power. Legal problems arise when a Deed of Granting Mortgage Rights is executed over marital property without the consent or signature of a former spouse who still holds rights over the property. This study aims to analyze the legal consequences and legal certainty of such deeds. It employs normative juridical research using statutory, case, conceptual, and analytical approaches. The findings show that a deed concerning marital property made without the consent of the entitled party may contain substantive defects and may be declared invalid or void by a court. Consequently, the Mortgage Right may lose its binding force, preferential right, and executorial power, while the underlying credit agreement remains valid insofar as it satisfies the requirements of a lawful contract. Legal certainty therefore requires harmonization of marriage law, security law, and contract law, together with strict prudential verification by banks and Land Deed Officials regarding marital status, ownership, property division, and consent before deed execution.
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