BaseFortify

Publication date: 2025-12-19

Last updated on: 2025-12-23

Assigner: Foxit

Description

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2025-12-19

Last Modified

2025-12-23

Generated

2026-07-06

AI Q&A

2025-12-19

EPSS Evaluated

2026-07-04

NVD

CVE-2025-66500

EUVD

EUVD-2025-204460

Affected Vendors & Products

Vendor	Product	Version / Range
foxit	pdf_editor_cloud	to 2025-12-01 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Impact Analysis

The vulnerability can allow an attacker to execute arbitrary JavaScript in the context of the affected web application. This can lead to unauthorized actions such as stealing sensitive information, hijacking user sessions, or performing actions on behalf of the user without their consent.

Executive Summary

This vulnerability is a stored cross-site scripting (XSS) issue in webplugins.foxit.com. It occurs because a postMessage handler does not properly validate the origin of incoming messages and directly assigns an externalPath value to a script source. This flaw allows an attacker to execute arbitrary JavaScript code by sending a crafted postMessage to the vulnerable component.

Hi! I’m here to help you understand CVE-2025-66500. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70