Coordinated JetBrains plugins siphon AI API keys from developers

Security researchers identified at least 15 malicious JetBrains Marketplace plugins, published under seven vendor accounts, that secretly exfiltrate AI provider API keys entered by users in plugin settings to a remote server. The plugins, which pretend to be AI coding assistants, code-review tools, and Git utilities, rely on services like OpenAI, DeepSeek, and SiliconFlow and share nearly identical code across multiple packages. They even offer a paid tier that may hand out API keys to paying users. The campaign ran from Oct 2025 to Jun 2026 and has been installed roughly 70,000 times, with the DeepSeek AI Assist and CodeGPT AI Assistant as the top downloads. JetBrains has not publicly commented as of publication.