CVE-2025-66500

Medium · 5.4

CVSS

5.4

EPSS

0.2%

Published

Dec 19, 2025

CISA due date

—

The record

A stored cross-site scripting (XSS) vulnerability exists in webplugins.foxit.com. A postMessage handler fails to validate the message origin and directly assigns externalPath to a script source, allowing an attacker to execute arbitrary JavaScript when a crafted postMessage is received.

Affected packages

Ecosystem	Package	Introduced	Fixed