CVE-2025-56200: Validator Project Validator

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

A URL validation bypass vulnerability exists in validator.js through version 13.15.15. The isURL() function uses '://' as a delimiter to parse protocols, while browsers use ':' as the delimiter. This parsing difference allows attackers to bypass protocol and domain validation by crafting URLs leading to XSS and Open Redirect attacks.

Affected products

• Validator Project Validator: up to and including 3.15.15

Published 2025-09-30. Last modified 2026-07-05.