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web: Block open redirects in RedirectHandler - #3766
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When the redirect target is formatted from parts of the input, and one of those parts appears at the start of the new URL, this can be used to construct protocol-relative URLs which effectively make an open redirect. Now we refuse to redirect to a protocol-relative URL unless the double slash was present in the configured pattern.
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When the redirect target is formatted from parts of the input, and one of those parts appears at the start of the new URL, this can be used to construct protocol-relative URLs which effectively make an open redirect. Now we refuse to redirect to a protocol-relative URL unless the double slash was present in the configured pattern.