A critical misconfiguration in AWS CodeBuild related to webhook filters allowed potential unauthorized access to AWS GitHub repositories, risking supply chain attacks. Amazon addressed the vulnerability, but the incident highlights the importance of securing CI/CD pipelines against untrusted contributions and misconfigured regex patterns. #CodeBreach #AWSCodeBuild #GitHubSecurity #CI/CDVulnerability
Keypoints
- A misconfiguration in AWS CodeBuild webhook filters could have enabled attackers to breach repositories and inject malicious code.
- The flaw involved incomplete regular expressions that allowed any GitHub user ID to bypass actor ID filters.
- Attackers could predict new GitHub user IDs and generate bot accounts to retrieve admin credentials.
- Using elevated permissions, attackers could push malicious code, exfiltrate secrets, and compromise repositories.
- AWS fixed the vulnerability and emphasized best practices like anchoring regex patterns and limiting credential permissions.
Read More: https://thehackernews.com/2026/01/aws-codebuild-misconfiguration-exposed.html