Spot a Wildcard Origin Combined With Credentials

How to Use This Tool

Summarize the two response fields that most often contradict each other. Audit pasted CORS response headers locally for allowed origin, credentials and the invalid wildcard-credentials combination.

The failure CORS Header Audit is designed to catch

A browser will reject credentialed access with a wildcard origin even when both headers appear individually permissive. The boundary is the job stated in Spot a Wildcard Origin Combined With Credentials; CORS Header Audit is not intended to score or transform a different workflow.

The CORS Header Audit input contract

The fields used for this specific operation are Input text, Unused option. Keep the source values beside the CORS Header Audit result, because replacing the original would remove the evidence needed to reproduce or reverse the operation.

• For CORS Header Audit, Input text starts at Access-Control-Allow-Origin: * Access-Control-Allow-Credentials: true in the worked case; replace that example with the matching source value.
• For CORS Header Audit, Unused option starts at in the worked case; replace that example with the matching source value.

Worked result for CORS Header Audit

The executable case called Default browser-only example expects out: Allowed origin: * Credentials: true Wildcard with credentials: unsafe combination. Verify that observation before entering real material, and then change one CORS Header Audit field at a time so an unexpected direction or formatting change can be traced to a specific input.

Reading the CORS Header Audit output

No. The transform runs in browser JavaScript and the page does not call a processing API. Network extensions or a compromised device remain outside this page's control. Apply that answer only when Input text, Unused option describe the same scope and format as the worked operation. If the source uses different units, quoting, nesting, timing or account rules, a plausible-looking CORS Header Audit output is not sufficient validation.

Assumptions attached to CORS Header Audit

• CORS Header Audit assumes that the pasted input uses the syntax described by the selected standard or page guidance.
• CORS Header Audit assumes that the operation is intentionally narrow and does not infer private downstream schema rules.

If one of these CORS Header Audit assumptions is false, keep the result as a diagnostic rather than production or decision data, and choose an implementation that explicitly supports the missing rule.

Evidence maintained for CORS Header Audit

The recorded reference is IETF RFC 9110 — HTTP Semantics. Reopen that source when the definition, format, fee or policy behind CORS Header Audit changes; private configuration and downstream acceptance still have to be checked in the user's own system.

Where CORS Header Audit runs

The named operation executes in browser JavaScript without an ecech calculation API. For CORS Header Audit, local execution reduces transmission but does not control browser extensions, device security or the destination where the result is pasted, so sensitive inputs still require the user's normal handling rules.