CVE-2026-22813 | THREATINT

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.

PUBLISHED Reserved 2026-01-09 | Published 2026-01-12 | Updated 2026-01-13 | Assigner GitHub_M

CRITICAL: 9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

< 1.1.10

affected

References

github.com/...encode/security/advisories/GHSA-c83v-7274-4vgp exploit

github.com/...encode/security/advisories/GHSA-c83v-7274-4vgp

cve.org (CVE-2026-22813)

nvd.nist.gov (CVE-2026-22813)

Download JSON