Command Injection Affecting @siteboon/claude-code-ui package, versions <1.25.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-SITEBOONCLAUDECODEUI-15627892
- published15 Mar 2026
- disclosed11 Mar 2026
- creditEthan-Yang, Dhiyaneshwaran, neo-ai-engineer
Introduced: 11 Mar 2026
NewCVE-2026-31975 (opens in a new tab)How to fix?
Upgrade @siteboon/claude-code-ui to version 1.25.0 or higher.
Overview
@siteboon/claude-code-ui is an A web-based UI for Claude Code CLI
Affected versions of this package are vulnerable to Command Injection through the authenticateWebSocket process and unsanitized input in the WebSocket shell handler. An attacker can execute arbitrary operating system commands by forging a JWT token using a known default secret and sending crafted WebSocket messages containing malicious payloads.