Prompt Injection Attacks in Large Language Models and AI Agent Systems: A Comprehensive Review of Vulnerabilities, Attack Vectors, and Defense Mechanisms. - Saidakhror Gulyamov; Said Gulyamov; Andrey Rodionov; Rustam Khursanov; Kambariddin Mekhmonov; Djakhongir Babaev; Akmaljon Rakhimjonov (Inf., 2026)