External risk intelligence

AWS Amplify Studio UI Component Property Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.0)

CVE-2025-4318

The vulnerability exists within a code generation and build-time UI component package. These tools are used by developers during software development, build, or deployment processes, not as public-facing services. Exposure is limited to internal development environments and CI/CD pipelines, making public internet reachability for this specific component highly unlikely.

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability has been identified in a component used within the AWS Amplify Studio UI, specifically related to how it handles expressions for UI components. This could potentially allow an authenticated user with modification privileges to execute arbitrary JavaScript code during the component rendering or build stages. The primary concern at this time is confirming if your development or build environments utilize this specific component and are therefore exposed.

Allows code execution during development builds.
Matters for developer tool security and supply chain.
Confirm relevance and any internal exposure.

Attack Path

How an attacker could exploit the issue

An attacker with authenticated access to create or modify UI components in AWS Amplify Studio could leverage a lack of input validation in the aws-amplify/amplify-codegen-ui package. This vulnerability could allow them to execute arbitrary JavaScript code during the component rendering and build phases, potentially leading to significant compromise.

Authenticated user access required.
Unvalidated component property expressions trigger vulnerability.
Arbitrary JavaScript execution during build.

Live Threat

Current exploitation, exposure, and threat context

When supported by the advisory, an authenticated user could execute arbitrary JavaScript code during the component rendering and build process. This could impact system data and sensitive information, depending on the execution context.

System data and sensitive information.
Via component rendering and build processes.
Potential for unauthorized code execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability resides within a development tool package used during the component rendering and build process, not in a production service. The first practical step is to identify all instances of the `aws-amplify/amplify-codegen-ui` package within your development, build, and CI/CD pipelines. Confirm whether any authenticated users with component modification privileges can trigger the vulnerable code execution, and then engage the development or platform engineering teams responsible for these pipelines to plan remediation.

Development and Platform Engineering teams own this.
Verify package usage in development pipelines.
Plan for dependency updates in CI/CD.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Free EASM Trial See How Signal Works

Frequently asked questions

What is the aws-amplify/amplify-codegen-ui package?

This package is a specialized set of development tools used to generate UI component code for AWS Amplify Studio. It automates the transformation of visual component designs into functional JavaScript code. Developers integrate this library into their local development environments or CI/CD pipelines to ensure their UI components are built and rendered correctly during the software development lifecycle.

What does CVE-2025-4318 mean for my code?

This vulnerability is classified as CWE-95, or Improper Neutralization of Directives in Dynamically Evaluated Code. Because the component property expressions lack input validation, the system may treat malicious input as executable code. In this specific CVE, the flaw allows unauthorized JavaScript to run during the build or rendering process, which could lead to a compromise of the build environment's integrity.

How is the CVE-2025-4318 vulnerability triggered?

The flaw is triggered when an authenticated user with sufficient permissions submits crafted property expressions to a UI component. It is important to note that this is not a traditional web request vulnerability; it requires the user to have actual access to modify UI component definitions. Simply visiting a page or interacting with a published application does not trigger this build-time flaw.

Why is the risk to public web services low for this CVE?

According to Halo Surface Signal, this vulnerability resides in a build-time toolset rather than a production web service. Because these packages operate within private development workflows or CI/CD pipelines, they are typically not accessible via the public internet. The threat is largely confined to the internal integrity of the software development supply chain rather than the end-user application.

How should I respond to CVE-2025-4318?

Begin by auditing your development environments and CI/CD configurations to locate the aws-amplify/amplify-codegen-ui package. Since this is a tooling issue, you do not need to restart production servers. Instead, coordinate with your platform engineering team to verify that only trusted users have component modification access and update the vulnerable dependency to a secure version as specified by the vendor.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.