Actionpack Open Redirect Vulnerability

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.87, the 99th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 2 Mar 2021. New records show when each source confirmed them.

Sources

• GitHub Advisory Database: GHSA-8877-prq4-9xfw
• OSV: GHSA-8877-prq4-9xfw
• nvd.nist.gov/vuln/detail/CVE-2021-22881
• github.com/rails/rails/commit/b5de7b3a4787d8a55aaad39f477c16e3af65e444
• hackerone.com/reports/1047447
• benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization
• discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130
• github.com/rails/rails
• github.com/rails/rails/blob/v6.1.2.1/actionpack/CHANGELOG.md
• github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2021-22881.yml
• groups.google.com/g/rubyonrails-security/c/zN_3qA26l6E
• lists.fedoraproject.org/archives/list/[email protected]/message/XQ3NS4IBYE2I3MVMGAHFZBZBIZGHXHT3
• rubygems.org/gems/actionpack
• www.openwall.com/lists/oss-security/2021/05/05/2

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.