VNX-603 – Use of Client-Side Authentication

Overview

VNX-603 maps to CWE-603: Use of Client-Side Authentication. Detects source patterns associated with CWE-603 (Use of Client-Side Authentication). Each finding should be manually reviewed for exploitability in context.

Severity: Medium | CWE: CWE-603 | Languages: node

Why This Matters

This weakness class (Use of Client-Side Authentication) creates a concrete exploit surface: the rule searches for the concrete source-level patterns most commonly associated with CWE-603 and surfaces them for review. Each finding should be evaluated in context — the rule catches the pattern, not the context.

What Gets Flagged

// FLAGGED: contains 'localStorage.setItem('auth'' pattern
localStorage.setItem('auth'

Remediation

  1. Review each flagged line and determine whether the pattern represents a real instance of CWE-603 or a false positive.
  2. Replace the flagged construct with a documented safe alternative appropriate to your language and framework.
  3. For confirmed false positives, add a # vulnetix-ignore: VNX-603 comment on the line.
  4. Ensure equivalent test coverage exists to prevent regression.

References