CVE-2026-43899: DeepChat is an open-source artificial intelligence agent platform that unifies models, tools, and agents. Prior to v1.0.

DeepChat, an open-source AI platform combining models, tools, and agents, has a vulnerability in versions before v1.0.4-beta.1 that allows remote code execution (RCE, where an attacker can run commands on a system they don't own). An attacker can use a malicious link in Markdown or a compromised AI endpoint to bypass security checks and execute arbitrary commands by exploiting unprotected pop-up window handlers in the application.