March 19.2025
2 Minutes Read

CISA Warns of Active Exploitation in GitHub Action Supply Chain Vulnerability

GitHub logo in red padlock on code background symbolizing supply chain compromise.

CISA Identifies Serious Vulnerability in GitHub Actions

The Cybersecurity and Infrastructure Security Agency (CISA) has raised alarms regarding a high-severity vulnerability connected to a third-party GitHub Action known as tj-actions/changed-files, which has been included in its Known Exploited Vulnerabilities (KEV) catalog. This critical flaw, tracked as CVE-2025-30066, possesses a CVSS score of 8.6, indicating significant risks for developers using this action.

The Implications of Compromised Code

The vulnerability allows attackers to inject malicious code into the GitHub Action, facilitating unauthorized access to sensitive information through action logs. CISA notes that the compromised secrets could include AWS access keys, GitHub personal access tokens (PATs), npm tokens, and private RSA keys, all of which are vital for maintaining the security of applications and client data.

A Cascading Supply Chain Attack

Recent investigations by cloud security firm Wiz suggest that this incident may represent a cascading supply chain attack. A threat actor appears to have initially compromised the reviewdog/action-setup@v1 GitHub Action, which was then used to exploit the tj-actions/changed-files action during its execution processes. Rami McCarthy, a researcher at Wiz, elaborates that this situation highlights the vulnerability of interconnected developer tools in the CI/CD workflows.

Steps to Guard Against Future Breaches

In response to the attack, CISA advises users to update to version 46.0.1 of the tj-actions/changed-files action by April 4, 2025, to mitigate risks. Developers are encouraged to replace susceptible actions with more secure alternatives, audit their workflows for unusual behavior, rotate any compromised secrets, and pin all GitHub Actions to specific commit hashes to avoid future exploitation. These proactive measures are crucial as the risk of reoccurrence remains, given the vulnerabilities associated with using third-party libraries.

Raising Awareness in the Developer Community

Such vulnerabilities emphasize the importance of cyber hygiene among developers and organizations leveraging open-source tools. With more than 23,000 repositories potentially affected, this incident serves as a reminder of the need for vigilance in maintaining secure CI/CD practices. The tech community must engage in heightened scrutiny of third-party actions to safeguard against similar exploitation.

Conclusion: The Importance of Cybersecurity in Development

As software development continues to rely heavily on third-party integrations, understanding and mitigating the risks associated with supply chain vulnerabilities becomes paramount. Developers should remain informed of potential threats and ensure robust security practices to protect their environments and data assets.

Cybersecurity Corner

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