HTML Injection Vulnerability in OpenCode by Anomaly Co.
CVE-2026-22813

9.4CRITICAL

Key Information:

Vendor

Anomalyco

Status
Opencode
Vendor
CVE Published:
12 January 2026

What is CVE-2026-22813?

OpenCode, an open source AI coding agent developed by Anomaly Co., contains a vulnerability in its markdown renderer that allows arbitrary HTML to be inserted into the Document Object Model (DOM). The renderer lacks proper sanitization measures, such as DOMPurify, and there is no Content Security Policy (CSP) implemented on the web interface. This vulnerability enables an attacker to control the underlying code execution during a chat session by exploiting HTML injection, potentially leading to unauthorized JavaScript execution on the local host environment. This issue has been addressed in version 1.1.10.

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Affected Version(s)

opencode < 1.1.10

References

https://github.com/anomalyco/opencode/security/advisories...
x_refsource_CONFIRM

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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