{"id":"CVE-2020-28481","aliases":["GHSA-fxwf-4rqh-v8g3"],"url":"https://o3.security/vulnerability/CVE-2020-28481","summary":"CORS misconfiguration in socket.io","details":"The package socket.io before 2.4.0 are vulnerable to Insecure Defaults due to CORS Misconfiguration. All domains are whitelisted by default.","published":"2021-01-19T15:15:12.060Z","modified":"2026-10-20T10:54:19.446474158Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"},"epss":{"score":0.0073,"percentile":0.51134,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"socket.io","fixedVersion":"2.4.0"}],"fix":{"url":"https://github.com/socketio/socket.io/commit/f78a575f66ab693c3ea96ea88429ddb1a44c86c7","label":"socketio/socket.io@f78a575"},"references":[{"type":"ADVISORY","url":"https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1056358"},{"type":"ADVISORY","url":"https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1056357"},{"type":"ADVISORY","url":"https://snyk.io/vuln/SNYK-JS-SOCKETIO-1024859"},{"type":"EVIDENCE","url":"https://github.com/socketio/socket.io/issues/3671"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-28481"},{"type":"WEB","url":"https://github.com/socketio/socket.io/commit/f78a575f66ab693c3ea96ea88429ddb1a44c86c7"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-20T10:54:19.446474158Z"}}