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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

Claude Code Action arbitrary code execution via malicious .mcp.json

A vulnerability in Claude Code Action prior to version 1.0.74 allowed attackers to achieve arbitrary code execution on GitHub Actions runners by including a malicious .mcp.json file in pull requests, potentially exfiltrating workflow secrets like API keys and tokens.

Disclosed 16 July 2026 · Record updated 13 September 2026

Impact

Arbitrary code execution on GitHub Actions runners with potential exfiltration of workflow secrets including API keys and tokens

Our coverage

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-47751