Unsanitized user input in Access-Control-Allow-Origin

• Rule ID: javascript_express_insecure_allow_origin
• Languages: javascript
• Source: insecure_allow_origin.yml

Description

Do not use unverified user-defined input to define Access-Control-Allow-Origin. This can lead to unintended user access to sensitive data.

Remediations

❌ Avoid defining origins with user input wherever possible.

✅ If unavoidable, be sure to verify the input or to use a safe-list.

Resources

• OWASP Origin & Access-Control-Allow-Origin

Associated CWE

• CWE-346: Origin Validation Error

OWASP Top 10

• A07:2021 - Identification and Authentication Failures

Configuration

To skip this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --skip-rule=javascript_express_insecure_allow_origin

To run only this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --only-rule=javascript_express_insecure_allow_origin