Critical severityOSV Advisory· Published Jan 12, 2026· Updated Jan 13, 2026
Malicious website can execute commands on the local system through XSS in the OpenCode web UI
CVE-2026-22813
Description
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 for a chat session gets JavaScript execution on the http://localhost:4096 origin. This vulnerability is fixed in 1.1.10.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
opencode-ainpm | < 1.1.10 | 1.1.10 |
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- github.com/advisories/GHSA-c83v-7274-4vgpghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-22813ghsaADVISORY
- github.com/anomalyco/opencode/security/advisories/GHSA-c83v-7274-4vgpghsax_refsource_CONFIRMWEB
News mentions
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