Vulnerability · Published Dec 19, 2025 · Assigned by Foxit

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

Medium 6.3

In plain English

A medium-severity cross-site scripting in pdfonline.foxit.com from Foxit Software Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)0.2%top 92.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Foxit Software Inc.	pdfonline.foxit.com	before 2025‑12‑01

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

References

https://www.foxit.com/support/security-bulletins.html