CVE-2025-4318: Input validation issue in AWS Amplify Studio UI component properties

Severity: critical (CVSS 9.0 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-05 · updated 2026-07-29
Weakness: CWE-95

Description

The AWS Amplify Studio UI component property expressions in the aws-amplify/amplify-codegen-ui package lack input validation. This could potentially allow an authenticated user who has access to create or modify components to run arbitrary JavaScript code during the component rendering and build process.

Affected products

Amazon Amplify Studio: from 0.1.0 before 2.20.3 — fixed in 2.20.3

How to fix

Upgrade to a fixed version: Amazon Amplify Studio 2.20.3. Check the vendor advisory for mitigations.

References

https://aws.amazon.com/security/security-bulletins/AWS-2025-010/
https://github.com/aws-amplify/amplify-codegen-ui/releases/tag/v2.20.3
https://github.com/aws-amplify/amplify-codegen-ui/security/advisories/GHSA-hf3j-86p7-mfw8
https://blog.securelayer7.net/cve-2025-4318-aws-amplify-rce/
https://github.com/aws-amplify/amplify-codegen-ui/commit/ca98c38b7c3d69ae7c94d2f62b51e32e8165dae6
https://github.com/aws-amplify/amplify-codegen-ui/security/advisories/GHSA-hf3j-86p7-mfw8
https://blog.securelayer7.net/cve-2025-4318-aws-amplify-rce/

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