Improper Validation of Specified Type of Input Affecting validator package, versions <13.15.20
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-VALIDATOR-13395830
- published17 Oct 2025
- disclosed10 Apr 2025
- creditjunwon seo
Introduced: 10 Apr 2025
CVE-2025-56200 (opens in a new tab)How to fix?
Upgrade validator to version 13.15.20 or higher.
Overview
validator is a library of string validators and sanitizers.
Affected versions of this package are vulnerable to Improper Validation of Specified Type of Input in the isURL() function which does not take into account : as the delimiter in browsers. An attackers can bypass protocol and domain validation by crafting URLs that exploit the discrepancy in protocol parsing that can lead to Cross-Site Scripting and Open Redirect attacks.