CVE-2025-66501 MEDIUM

CVE-2025-66501: Foxit pdfonline.foxit.com Stored Cross-Site Scripting in eSign Predefined Text Feature

Vendor Foxit Software Inc.
Product pdfonline.foxit.com
Weakness CWE-79 · XSS
Published December 19, 2025
Last update December 19, 2025

CVSS base score

6.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality High
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

What the vulnerability does

01Description

A stored cross-site scripting (XSS) vulnerability exists in pdfonline.foxit.com within the Predefined Text feature of the Foxit eSign section. A crafted payload can be stored via the Identity “First Name” field, which is later rendered into the DOM without proper sanitization. As a result, the injected script may execute when predefined text is used or when viewing document properties.

Key dates

02Disclosure timeline

December 19, 2025 CVE published
December 19, 2025 Record updated