Cross-site Referrer Leakage through usage of no-referrer-when-downgrade in Referrer-Policy
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Summary
Invicti detected that no-referrer-when-downgrade is used in the Referrer-Policy declaration.
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
Referrer leakage is possible between two sites if they use either same or a higher protocol.
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