{"id":"CVE-2020-8184","aliases":["GHSA-j6w9-fv6q-3q52"],"url":"https://o3.security/vulnerability/CVE-2020-8184","summary":"Rack allows Percent-encoded cookies to overwrite existing prefixed cookie names","details":"A reliance on cookies without validation/integrity check security vulnerability exists in rack < 2.2.3, rack < 2.1.4 that makes it is possible for an attacker to forge a secure or host-only cookie prefix.","published":"2020-06-19T17:15:18.757Z","modified":"2026-07-08T05:56:14.669277847Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"RubyGems","name":"rack","fixedVersion":"2.1.4"},{"ecosystem":"RubyGems","name":"rack","fixedVersion":"2.2.3"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2020/07/msg00006.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2023/01/msg00038.html"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4561-1/"},{"type":"FIX","url":"https://groups.google.com/g/rubyonrails-security/c/OWtmozPH9Ak"},{"type":"FIX","url":"https://hackerone.com/reports/895727"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T05:56:14.669277847Z"}}