Medium
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-56200
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 08:57 UTC · Revision 1
Source evidence
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.
osv:CVE-2025-56200
Complete source record
{
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"url": "https://osv.dev/vulnerability/CVE-2025-56200",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2025-56200",
"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.",
"evidence": "osv:CVE-2025-56200",
"products": [],
"severity": "medium",
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"aliases": [
"CVE-2025-56200",
"GHSA-9965-vmph-33xx"
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"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
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"type": "GIT",
"events": [
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"versions": [
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],
"database_specific": {
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}
}
],
"modified": "2026-10-28T02:30:50.430423865Z",
"provider": "osv",
"references": [
"https://gist.github.com/junan-98/27ae092aa40e2a057d41a0f95148f666",
"https://gist.github.com/junan-98/a93130505b258b9e4ec9f393e7533596",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/56xxx/CVE-2025-56200.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-56200",
"https://github.com/validatorjs/validator.js"
],
"provider_metadata": {
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"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/56xxx/CVE-2025-56200.json"
}
},
"related_cves": [
{
"value": "CVE-2025-56200",
"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 518823,
"published_at": "2025-09-30T00:00:00+00:00"
}