BaseFortify

Publication date: 2025-09-30

Last updated on: 2026-07-05

Assigner: MITRE

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.

CVSS Scores

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Meta Information

Published

2025-09-30

Last Modified

2026-07-05

Generated

2026-07-06

AI Q&A

2025-09-30

EPSS Evaluated

2026-07-05

NVD

CVE-2025-56200

Affected Vendors & Products

Vendor	Product	Version / Range
validator_project	validator	to 3.15.15 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This vulnerability is a URL validation bypass in validator.js up to version 13.15.15. The isURL() function incorrectly uses '://' as a delimiter to parse protocols, whereas browsers use ':' as the delimiter. This discrepancy allows attackers to craft URLs that bypass protocol and domain validation checks.

Impact Analysis

The vulnerability can lead to security issues such as Cross-Site Scripting (XSS) and Open Redirect attacks by allowing attackers to bypass URL validation and trick applications into accepting malicious URLs.

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