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

June 11, 2021 (updated June 22, 2021)

The actionpack ruby gem suffers from a possible open redirect vulnerability. 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

hackerone.com/reports/1148025
nvd.nist.gov/vuln/detail/CVE-2021-22903

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