CVE-2025-56200

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 v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
validator_project	validator	< 3.15.15

References

Exploits

https://gist.github.com/junan-98/27ae092aa40e2a057d41a0f95148f666 https://gist.github.com/junan-98/a93130505b258b9e4ec9f393e7533596

Other References

http://validatorjs.com https://github.com/validatorjs/validator.js

Frequently Asked Questions

What is CVE-2025-56200? +

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. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2025-56200? +

CVE-2025-56200 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-56200? +

CVE-2025-56200 affects products from validator_project, specifically: validator. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-56200? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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