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CWE - 601 : URL Redirection to Untrusted Site ('Open Redirect')

CWE Definition
Number of vulnerabilities: 64
Description A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks.An http parameter may contain a URL value and could cause the web application to redirect the request to the specified URL. By modifying the URL value to a malicious site, an attacker may successfully launch a phishing scam and steal user credentials. Because the server name in the modified link is identical to the original site, phishing attempts have a more trustworthy appearance.
Background Details Phishing is a general term for deceptive attempts to coerce private information from users that will be used for identity theft.
Other Notes

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