GitHub Actions Supply Chain Attack Puts Thousands of Project...

A supply chain attack on the widely-used GitHub Action `tj-actions/changed-files` compromised thousands of projects by exposing sensitive secrets in CI/CD logs, prompting developers to secure their workflows urgently. The attack was detected by StepSecurity, revealing that a threat actor accessed the action’s repository, likely with stolen credentials, and modified version tags to inject malicious code into workflows, assigned CVE-2025-30066. This breach affected over 23,000 repositories, potentially compromising API keys, authentication tokens, and passwords, necessitating credential rotation and workflow audits. The incident underscores the vulnerability of trusted actions as attack vectors, urging developers to adopt mitigation strategies such as pinning actions to specific commit SHAs, restricting third-party actions, and strengthening CI/CD infrastructure security. As GitHub Actions become more integral to automation, organizations must treat build systems with the same security rigor as production environments to prevent future supply chain attacks.

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