CVE-2025-66500
Unknown Unknown - Not Provided
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.
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Meta Information
Published
2025-12-19
Last Modified
2025-12-23
Generated
2026-06-16
AI Q&A
2025-12-19
EPSS Evaluated
2026-06-14
NVD
CVE-2025-66500
EUVD
EUVD-2025-204460
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
foxit pdf_editor_cloud to 2025-12-01 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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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.
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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.

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