CVE-2017-7559: Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling)
(updated )
Invalid characters are allowed in query strings and path parameters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack, or obtain sensitive information from requests other than their own.
References
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