GHSA-C83V-7274-4VGP Malicious website can execute commands on the local system through XSS in the OpenCode web UI

Summary A malicious website can abuse the server URL override feature of the OpenCode web UI to achieve cross-site scripting on http://localhost:4096. From there, it is possible to run arbitrary commands on the local system using the /pty/ endpoints provided by the OpenCode API. Code execution vi...

Malicious website can execute commands on the local system through XSS in the OpenCode web UI

Summary A malicious website can abuse the server URL override feature of the OpenCode web UI to achieve cross-site scripting on http://localhost:4096. From there, it is possible to run arbitrary commands on the local system using the /pty/ endpoints provided by the OpenCode API. Code execution vi...

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...