GHSA-5c57-rqjx-35g2: Cline Kanban Server has a Cross-Origin WebSocket Hijacking Vulnerability
Summary
The kanban npm package (used by the cline CLI tool) runs a WebSocket server on localhost that accepts connections from any website without checking the Origin header (a validation that confirms the connection came from an authorized source). This allows attackers to leak sensitive data like file paths and AI chat messages, inject commands into running terminals to achieve remote code execution (executing arbitrary code on a developer's machine), and kill running tasks.
Vulnerability Details
EPSS: 0.0%
May 8, 2026
Classification
Affected Vendors
Affected Packages
Related Issues
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Original source: https://github.com/advisories/GHSA-5c57-rqjx-35g2
First tracked: May 8, 2026 at 08:00 PM
Classified by LLM (prompt v3) · confidence: 95%