CVE-2025-56200
validator.js has a URL validation bypass vulnerability in its isURL function
6.1
MEDIUM
CVSS 3.1
EPSS 0.05%
Description
A URL validation bypass vulnerability exists in validator.js prior to version 13.15.20. 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.
How to fix CVE-2025-56200
To remediate CVE-2025-56200, upgrade the affected package to a fixed version below.
- —upgrade to 13.15.20 or later
Is CVE-2025-56200 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 13.15.20
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |