A URL validation bypass vulnerability exists in validator.js through version 13.15.15.
Priority LOW 27CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
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 it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00324 25th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Fixed validator (npm): 13.15.20
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | validator (npm) | before 13.15.20 | 13.15.20 | Patch available | GHSA-9965-vmph-33xx |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- validator (npm) Vendor— Affected before 13.15.20 Fixed in 13.15.20 Patch available GHSA-9965-vmph-33xx
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:validator_project:validator:*:*:*:*:*:node.js:*:* | up to 3.15.15 | Vulnerable | Validator Project |
- cpe:2.3:a:validator_project:validator:*:*:*:*:*:node.js:*:* Versions up to 3.15.15 Vulnerable ·Validator Project
Remediation
- Fix · GHSA-9965-vmph-33xx validator (npm) Fixed in 13.15.20 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-56200
- 2026-10-03 Alias added: GHSA-9965-vmph-33xx
References
Exploit 2
Other 6
- https://github.com/validatorjs/validator.js
- https://github.com/validatorjs/validator.js/issues/2600
- https://github.com/validatorjs/validator.js/pull/2608
- https://github.com/validatorjs/validator.js/commit/cbef5088f02d36caf978f378bb845fe49bdc0809
- https://github.com/validatorjs/validator.js/releases/tag/13.15.20
- http://validatorjs.com
More Validator Project Validator vulnerabilities
- TI-2025-11693 Versions of the package validator before 13.15.22 are vulnerable to Incomplete Filtering… CVSS 4.0HIGH 8.7
- TI-2021-02697 Inefficient Regular Expression Complexity in validatorjs/validator.js CVSS 3.1HIGH 7.5
Sources
- CVE-2025-56200 · CVE Program
- CVE-2025-56200 · NVD
- FIRST EPSS
- GHSA-9965-vmph-33xx · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences