6.1

CVSS Score

3.0

-

CVSS Score

Basic Information

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CVE-2013-7451

CVE-2013-7451: Moderate severity vulnerability that affects validator

The validator module before 1.1.0 for Node.js allows remote attackers to bypass the XSS filter via a nested tag.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2013-7451

CVE-2013-7451:

6.1

CVSS Score

3.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
validator	npm	< 1.1.0	1.1.0

Technical Details

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Miggo AI

Root Cause Analysis

The vulnerability centers around improper HTML sanitization in the XSS filter. The key functions identified are:

validator.xss.clean: The primary entry point for XSS filtering, modified extensively in the patch to add missing protections. The pre-patch version lacked proper handling of:
- Nested forbidden patterns in attributes
- HTML entity decoding before validation
- Base64 data URI filtering
- Array prototype manipulation protection
filter_attributes: Directly processes HTML attributes and was vulnerable to regex bypasses. The patch completely rewrote its logic to prevent comment-based bypasses and improve pattern matching.

The test case changes demonstrate exploitation scenarios involving nested tags (like <comment>), javascript: URI bypasses, and attribute-based payloads - all of which would flow through these functions. The patch modifications directly target these vulnerable code paths by adding proper filtering layers.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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