CVE-2021-22903: URL Redirection to Untrusted Site (Open Redirect)

June 11, 2021 (updated October 21, 2021)

This is similar to CVE-2021-22881. Specially crafted Host headers in combination with certain allowed host formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website.

References

groups.google.com/g/rubyonrails-security/c/8TxqXEtgSF0
nvd.nist.gov/vuln/detail/CVE-2021-22903

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