CVE-2025-66523 Reflected Cross-Site Scripting (XSS) Vulnerability in na1.foxitesign.foxit.com via Unsanitized URL Parameters
Attackers can inject arbitrary scripts via unsanitized URL parameters, potentially compromising authenticated user sessions on Foxit eSign.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-66523?
CVE-2025-66523 is a medium-severity cross-site scripting vulnerability in na1.foxitesign.foxit.com, published on 20 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2025-66523?
It affects 1 product.
Products include Foxit Esign.
How do I fix CVE-2025-66523?
No fix has been published for CVE-2025-66523 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-66523 being exploited?
There is no known exploitation of CVE-2025-66523 in the wild and no public exploit code.
Other vulnerabilities in na1.foxitesign.foxit.com
Sources
Also known as GHSA-jv72-wxjv-h5q2.