Amazon Web Services (AWS) has addressed a critical security flaw (CVE-2025-4318) in its AWS Amplify Studio platform, which could have allowed authenticated attackers to execute malicious JavaScript code during component rendering.
The vulnerability, publicly disclosed on May 5, 2025, affects the amplify-codegen-ui package, a core tool for generating front-end code in Amplify Studio.
Vulnerability Details
The flaw resides in how the expression-binding function processes UI component schemas when using the create-component command.
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Attackers exploiting this input validation issue could inject arbitrary code into component properties, triggering execution during rendering or builds.
| CVE ID | Severity | Affected Product | Affected Versions | Fixed Version |
| CVE-2025-4318 | Critical | AWS Amplify Studio (amplify-codegen-ui) | ≤2.20.2 | 2.20.3 |
- Arbitrary Code Execution: Attackers with component creation/modification privileges could compromise backend systems.
- Data Theft or Service Disruption: Malicious scripts might exfiltrate sensitive data or disrupt application workflows.
- Supply Chain Attacks: Compromised components could spread to downstream applications.
AWS confirmed no active exploits were detected in the wild before patching.
Mitigation Steps
- Upgrade Immediately: Update to amplify-codegen-ui version 2.20.3 via the AWS CLI or Amplify Studio interface.
- Audit Custom Components: Review component schemas for unexpected code snippets.
- Restrict Permissions: Limit component editing rights to trusted users.
“We strongly recommend upgrading and auditing derivative codebases,” stated the AWS Security team.
Best Practices for Amplify Studio Users
- Monitor Build Logs: Watch for unusual activity in component rendering pipelines.
- Enable AWS CloudTrail: Track API calls related to component modifications.
- Validate Third-Party Components: Scan imported schemas for untrusted code.
AWS urges users to report concerns to aws-security@amazon.com and stay updated via the AWS Security Bulletin Hub.
Impacted Industries: E-commerce, SaaS platforms, and enterprises relying on Amplify Studio for rapid UI development.
This incident highlights the importance of rigorous input validation in low-code environments. Developers using forked versions of amplify-codegen-ui must manually apply the official fix.
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