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Fencer Vulns
critical 9.0

CVE-2025-4318 json

Input validation issue in AWS Amplify Studio UI component properties

published 2025-05-05 18 mo ago modified 2026-07-30 3 mo ago also GHSA-hf3j-86p7-mfw8 , EUVD-2025-13500

cvss
9.0
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm @aws-amplify/codegen-ui-react 2.20.3
  • Amazon Amplify Studio 2.20.3

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
15 mo ago

Exploit prediction

0.99% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • blog.securelayer7.net https://blog.securelayer7.net/cve-2025-4318-aws-amplify-rce/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 9.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CNA 4.0 9.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
npm @aws-amplify/codegen-ui-react
<2.20.3
2.20.3

Affected products

  • Amazon Amplify Studio

Classification

Weakness
  • CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.