"Magento 1900" usually refers to Magento Community Edition (CE) versions before 1.9.0.1 , which were famously vulnerable to Remote Code Execution (RCE)
Real exploits used Metasploit modules or standalone PHP scripts with serialized gadget chains.
GitHub links and proof-of-concept exploits: magento 1900 exploit github link
joren485/Magento-Shoplift-SQLI: Proof of Concept ... - GitHub
The Ghost in the Cart: A Reflection on the Magento "Shoplift" Crisis "Magento 1900" usually refers to Magento Community Edition
Magento Exploits Topic: A central hub for various PoCs, including SQL injections like CVE-2019-7139.
Security Blogs and News Sites: Websites like Cybersecurity News, Threatpost, and Dark Reading frequently cover vulnerabilities and exploits. These sources can provide valuable information on a wide range of cybersecurity topics, including Magento. SUPEE-5344 analysis Magento 1
SUPEE-5344 analysisMagento 1.9 RCE proof of conceptCVE-2015-1397 writeupGitHub Repositories: While the original exploit code is often hosted on platforms like Exploit-DB, various proof-of-concepts and security scripts can be found on GitHub: