The Anthropic Claude Code GitHub Action Vulnerability Allows Attackers to Take Over Repositories via a Single Issue

The Anthropic Claude Code GitHub Action Vulnerability Allows Attackers to Take Over Repositories via a Single Issue

2026-06-04 15:15View Original

Security researchers have disclosed a vulnerability in Anthropic's Claude Code GitHub Action, allowing attackers to take over vulnerable public repositories running the action by simply opening a GitHub Issue.

Since Anthropic's own operational repository uses the same workflow, a successful exploit could push malicious code directly into the action itself, affecting all downstream projects that pull this repository. The vulnerability was discovered by GMO researcher RyotaK.

Disclaimer: Contains third-party opinions, does not constitute financial advice

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