The Northeast region of Nigeria is characterized by persistent security challenges that significantly impact economic activities, including mortgage banking. This study evaluates the effects of these challenges on the operational performance, customer confidence, and growth prospects of mortgage banks in the region. A survey design was employed, and a quantitative research method was adopted to assess the impact of security challenges on mortgage banking in the region. A sample of one thousand two hundred (1,200) respondents was selected from a targeted population of two thousand (2,000) in the state capitals of Adamawa, Bauchi, Gombe, and Taraba. The analysis, grounded in empirical data, highlights several critical findings. The results reveal that security challenges and infrastructure deficits pose significant and interrelated risks to the operations of mortgage banks and real estate development in Northeast Nigeria. Specifically, insecurity has led to branch closures, increased operational costs, and a decline in mortgage uptake. Statistical analysis supports these findings: Chi-Square tests indicate a highly significant relationship between security challenges and operational disruptions (χ² = 2158.97, p < 0.001). Additionally, the high correlation coefficients (Pearson’s r=0.888r = 0.888r=0.888, Spearman’s ρ=0.956\rho = 0.956ρ=0.956) confirm the strong negative influence of security issues on mortgage banking activities. The study recommends enhanced security measures, risk-sharing mechanisms, and the integration of digital banking to mitigate the adverse effects of insecurity on the mortgage banking sector.