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CVE-2025-56200

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Date: September 29, 2025

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.

Severity Score

Related Resources (6)

http://validatorjs.com
https://gist.github.com/junan-98/27ae092aa40e2a057d41a0f95148f666
https://nvd.nist.gov/vuln/detail/CVE-2025-56200
https://github.com/validatorjs/validator.js
https://gist.github.com/junan-98/a93130505b258b9e4ec9f393e7533596
https://www.mend.io/vulnerability-database/CVE-2025-56200

Severity Score

Weakness Type (CWE)

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-79

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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