Cross-site Referrer Leakage through usage of unsafe-url in Referrer-Policy

Summary#

Invicti detected that the Referrer-Policy permits Referrer leakage by using unsafe-url.

If a comma-separated referrer-policy is specified in the header, fallback policy is used only if the browser does not support the set referrer-policy, which may cause Cross-site Referrer Leakage.

Impact#

If any traffic occurs from this site to a cross-site, the full URL will be leaked through the Referer header in the request.

Remediation#

See all available options by using links in External References and use a secure one.

Classifications#

ISO27001-A.14.2.5, OWASP 2017-A6, OWASP 2013-A6, CWE-200

Cross-site Referrer Leakage through usage of unsafe-url in Referrer-Policy

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