CVE-2026-22813 Malicious website can execute commands on the local system through XSS in the OpenCode web UI

OpenCode is an open source AI coding agent. The markdown renderer used for LLM responses will insert arbitrary HTML into the DOM. There is no sanitization with DOMPurify or even a CSP on the web interface to prevent JavaScript execution via HTML injection. This means controlling the LLM response...

CVE-2026-22813

The CVE-2026-22813 issue affects OpenCode, where the markdown renderer for LLM responses does not sanitize HTML, allowing arbitrary HTML/JavaScript to run in the OpenCode web UI at http://localhost:4096. The root cause is lack of DOM sanitization and CSP, enabling XSS that can leverage the localh...