Vulnerability · Published Nov 3, 2026 · Assigned by AMZN

CVE-2026-121652Stored cross-site scripting (XSS) in AWS Amplify maplibre-gl-js-amplify popup rendering

Medium 5.4

In plain English

A medium-severity cross-site scripting in maplibre-gl-js-amplify from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 81.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Cross-site scripting (XSS) issue in AWS Amplify maplibre-gl-js-amplify before 4.0.3 might allow remote authenticated users to inject arbitrary web script or HTML via the (1) title, (2) address, or (3) place_name property in GeoJSON feature data rendered by popupRender, or the (4) geofenceId value rendered in AmplifyGeofenceControl. To remediate this issue, users should upgrade to 4.0.3 or later.

Affected products (as reported)

Vendor	Product	Versions
AWS	maplibre-gl-js-amplify	0 – before 4.0.3

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

https://github.com/aws-amplify/maplibre-gl-js-amplify/releases/tag/v4.0.3 release-notes, patch
https://github.com/aws-amplify/maplibre-gl-js-amplify/security/advisories/GHSA-34v3-xxqp-g5g9 third-party-advisory
https://aws.amazon.com/security/security-bulletins/2026-167-aws/ vendor-advisory