What is the CVSS score of CVE-2025-56200?

CVE-2025-56200 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Open Redirect are affected by CVE-2025-56200?

Organizations using validator.js should be aware of moderate risk from CVE-2025-56200, a cross-site scripting vulnerability rated CVSS 6.1.. A patch is available.

Is there a public PoC exploit available for CVE-2025-56200?

Yes, a public proof-of-concept exploit is available for CVE-2025-56200. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2025-56200?

Within 30 days: Identify affected systems running validator.js and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Open Redirect CVE-2025-56200

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2025-09-30 cve@mitre.org

Open Redirect XSS Validator

6.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.1 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 28, 2026 - 19:15 vuln.today

PoC Detected

Oct 18, 2025 - 01:48 vuln.today

Public exploit code

CVE Published

Sep 30, 2025 - 18:15 nvd

MEDIUM 6.1

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

134 npm packages depend on validator (46 direct, 88 indirect)

Ecosystem-wide dependent count for version 13.15.20.

DescriptionCVE.org

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.

AnalysisAI

A URL validation bypass vulnerability exists in validator.js through version 13.15.15. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. 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. Affected products include: Validator Project Validator. Version information: version 13.15.15..

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.