Archon 0.2.13 through 0.11.1 Missing Authentication via /api/* Control API

Archon 0.2.13 through 0.11.1 contains a missing authentication vulnerability that allows unauthenticated attackers to access the /api/* control API, which binds to 0.0.0.0 by default. Attackers with network access can send messages to the AI coding agent, which runs with bypassPermissions, to execute commands on the host as the Archon user.

packages/core/contact.php in Archon 3.21 rev-1 has XSS in the referer parameter in an index.php?p=core/contact request, aka Open Bug Bounty ID OBB-278503.