CVE-2025-56200
Medium
Description
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.
SeverityMedium
CVSS6.1
Exploit probability—
ProductValidator
PublishedSep 30, 2025
First seenSep 30, 2025
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- validator13.15.20 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| validator_project validator | v ≤ 3.15.15 | — |
| validatornpm | v < 13.15.20 | 13.15.20 |
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