CVE-2025-56200
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-30

Last updated on: 2025-10-18

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.
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Meta Information
Published
2025-09-30
Last Modified
2025-10-18
Generated
2026-06-16
AI Q&A
2025-09-30
EPSS Evaluated
2026-06-15
NVD
CVE-2025-56200
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
validator_project validator to 3.15.15 (inc)
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Exploitability
CWE
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KEV
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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.
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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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