CVE-2026-22813
HTML Injection in OpenCode Markdown Renderer Enables JavaScript Execution
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Affected Vendors & Products
| Vendor | Product | Version |
|---|---|---|
| opencode | opencode | 1.1.10 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
How can this vulnerability impact me? :
How can this vulnerability be detected on my network or system? Can you suggest some commands?
What immediate steps should I take to mitigate this vulnerability?
Ask Our AI Assistant
Need more information? Ask your question to get an AI reply (Powered by our expertise)
0/70
EPSS Chart
Meta Information
CVE Publication Date:
2026-01-12
CVE Last Modified Date:
2026-01-12
Report Generation Date:
2026-01-21
AI Powered Q&A Generation:
2026-01-13
EPSS Last Evaluated Date:
2026-01-20
NVD Report Link: