PT-2025-40012 · Unknown · Validator.Js

Junan-98 · Published 2025-09-30 · Updated 2025-12-23 · CVE-2025-56200

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions validator.js versions through 13.15.15

Description A flaw exists in the URL validation process within validator.js. The isURL() function utilizes '://' to identify protocols during parsing, differing from the ':' delimiter used by web browsers. This discrepancy enables attackers to circumvent protocol and domain validation checks, potentially leading to Cross-Site Scripting (XSS) and Open Redirect attacks. The vulnerable component is the isURL() function.

Recommendations Update to a version of validator.js newer than 13.15.15.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2025-56200

GHSA-9965-VMPH-33XX

Affected Products

Validator.Js

References · 17

• 🔥 https://gist.github.com/junan-98/a93130505b258b9e4ec9f393e7533596 · Exploit
• 🔥 https://gist.github.com/junan-98/27ae092aa40e2a057d41a0f95148f666 · Exploit
• https://ubuntu.com/security/CVE-2025-56200 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-9965-vmph-33xx · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-56200 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-56200 · Security Note
• https://cve.org/CVERecord?id=CVE-2025-56200 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-56200 · Vendor Advisory
• https://github.com/validatorjs/validator.js · Note
• https://github.com/validatorjs/validator.js/commit/cbef5088f02d36caf978f378bb845fe49bdc0809 · Note
• https://github.com/validatorjs/validator.js/pull/2608 · Note
• https://github.com/validatorjs/validator.js/releases/tag/13.15.20 · Note
• https://github.com/validatorjs/validator.js/issues/2600 · Note
• https://t.me/CVEtracker/33752 · Telegram Post
• https://twitter.com/VulmonFeeds/status/1973107554977731041 · Twitter Post