AWS CodeBuild Flaw (CodeBreach) Risked GitHub Repo Takeover in 2025

AWS CodeBuild Misconfiguration Exposed GitHub Repositories to Supply Chain Attacks

A critical security misconfiguration in Amazon Web Services (AWS) CodeBuild could have enabled threat actors to compromise AWS’s own GitHub repositories—including the AWS JavaScript SDK—potentially triggering widespread supply chain attacks across AWS environments. The vulnerability, dubbed CodeBreach, was identified by cloud security firm Wiz and patched by AWS in September 2025 following responsible disclosure.

Technical Details of CodeBreach

The flaw stemmed from a misconfiguration in AWS CodeBuild’s integration with GitHub repositories. According to Wiz researchers, the issue allowed unauthorized access to AWS’s internal GitHub repositories by exploiting overly permissive OAuth token scopes and build project settings. While the exact technical mechanics remain undisclosed, the misconfiguration could have granted attackers:

• Full repository access, including read/write permissions
• Ability to inject malicious code into AWS SDKs or other critical repositories
• Potential for supply chain compromise, as tampered dependencies could propagate across AWS services

Wiz emphasized that the vulnerability did not require prior AWS account access, making it particularly severe for organizations relying on AWS’s managed build services.

Impact Analysis

Had the flaw been exploited, the consequences could have been catastrophic:

• Supply chain attacks: Malicious actors could have altered AWS SDKs or other dependencies, leading to backdoored software deployments for AWS customers.
• Data exfiltration: Sensitive repository data, including proprietary AWS code, could have been exposed.
• Reputation damage: A successful attack on AWS’s own repositories would have undermined trust in the platform’s security.

Wiz did not disclose whether the vulnerability was actively exploited before the patch. AWS has not reported any evidence of misuse.

Recommendations for Security Teams

While AWS has remediated the issue, security professionals should:

1. Audit CodeBuild configurations: Review GitHub repository integrations for overly permissive OAuth tokens or build project settings.
2. Monitor for supply chain risks: Implement dependency scanning and integrity checks for AWS SDKs and other third-party libraries.
3. Enforce least-privilege access: Restrict repository permissions to only necessary roles and services.
4. Stay updated on cloud security advisories: Subscribe to AWS security bulletins for emerging threats.

AWS has not assigned a CVE ID to this vulnerability, but organizations are advised to verify their CodeBuild deployments align with AWS’s latest security best practices.

Original report by The Hacker News.