Insecure CORS Wildcard with Credentials

High Severity Technical Guide

Vulnerability Description

Enabling wildcards * in Access-Control-Allow-Origin combined with authentication configurations can allow malicious scripts to fetch private user data.

Remediation Guide

To resolve this vulnerability, follow these config changes or developer practices:

Never combine Access-Control-Allow-Origin: * with Access-Control-Allow-Credentials: true. Explicitly validate origin headers.

Verify Your Fix

After applying the remediation, run an external attack-surface scan to verify that the vulnerability is no longer detected by WebScanify.

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