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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

OpenCode AI coding agent: unauthenticated local RCE and XSS in web UI

Two vulnerabilities were disclosed in the open source OpenCode AI coding agent: an unauthenticated local HTTP server with permissive CORS allowing any local process or website to run arbitrary shell commands (CVE-2026-22812), and an unsanitized markdown renderer allowing JavaScript execution on the localhost web interface via crafted LLM responses (CVE-2026-22813). Fixes shipped in versions 1.0.216 and 1.1.10 respectively.

Disclosed 12 January 2026 · Record updated 13 September 2026

Impact

Any local process or malicious website could execute arbitrary shell commands with the user's privileges; controlling an LLM response could execute JavaScript on the http://localhost:4096 origin.

Our coverage

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-22812
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-22813