{"action":"Upgrade actionpack to 5.2.4.3 or later.","affected":[{"fixed":"5.2.4.3","introduced":"5.0.0"},{"fixed":"6.0.3.1","introduced":"6.0.0"}],"component":"actionpack","cve_ids":["CVE-2020-8166"],"ecosystem":"RubyGems","epss":0.01673,"exploited":false,"fixed_versions":["5.2.4.3","6.0.3.1"],"ghsa_id":"GHSA-jp5v-5gx4-jmj9","id":"tcs_01M5KEKZT6NGEPZ9A4M1KMX8XQ","modified_at":"2026-05-05T22:34:32.923444Z","published_at":"2020-05-26T15:11:13Z","references":["https://osv.dev/vulnerability/GHSA-jp5v-5gx4-jmj9","https://nvd.nist.gov/vuln/detail/CVE-2020-8166","https://hackerone.com/reports/732415","https://github.com/rails/rails","https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2020-8166.yml","https://groups.google.com/forum/#!topic/rubyonrails-security/NOjKiGeXUgw","https://groups.google.com/g/rubyonrails-security/c/NOjKiGeXUgw","https://www.debian.org/security/2020/dsa-4766"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GHSA-jp5v-5gx4-jmj9","url":"https://osv.dev/vulnerability/GHSA-jp5v-5gx4-jmj9"}],"summary":"Ability to forge per-form CSRF tokens in Rails"}