CVE-2025-56200: A URL validation bypass vulnerability exists in validator.js through version 13.15.15

Routine

MEDIUM 6.1UPGRADE

CVE-2025-56200 is a medium-severity flaw (CVSS 6.1) affecting validator. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-09-30
Last modified	2026-07-05

Publisher (CNA): MITRE · Vendor: validator project

Last updated 2026-07-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-30 18:15 UTCPublished CVE record published
2026-07-05 02:16 UTCUpdated Record last modified

validator project validator UPGRADE

Affected: <= 3.15.15

Fixed in: newer than 3.15.15

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls validator

2. UPGRADE to newer than 3.15.15

npm install validator@">3.15.15"

Advisories and coverage

Research and news

Vulners Bulletins: CVE-2025-56200 2026-10-29

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-56200?

validator: upgrade to newer than 3.15.15. Exact commands for each OS are on this page.

Is CVE-2025-56200 being exploited?

CVE-2025-56200 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-56200 affect?

CVE-2025-56200 affects validator. Severity is medium (CVSS 6.1). 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 b

How urgent is CVE-2025-56200?

Priority 33/100. Public exploit reference

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References

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