CVE-2025-66523: Reflected Cross-Site Scripting (XSS) Vulnerability in na1.foxitesign.foxit.com via Unsanitized URL Parameters

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-20 · updated 2026-06-17
Weakness: CWE-79

Description

URL parameters are directly embedded into JavaScript code or HTML attributes without proper encoding or sanitization. This allows attackers to inject arbitrary scripts when an authenticated user visits a crafted link. This issue affects na1.foxitesign.foxit.com: before 2026‑01‑16.

Affected products

Foxit Software Inc. na1.foxitesign.foxit.com: before 2026-01-16 — fixed in 2026-01-16

How to fix

Upgrade to a fixed version: Foxit Software Inc. na1.foxitesign.foxit.com 2026-01-16. Check the vendor advisory for mitigations.

References

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

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