{"id":"CVE-2020-28481","aliases":["AZL-44430","CLSA-2026-1771978231","CLSA-2026-1776818218","CLSA-2026-1792604680","CLSA-2026-1793304087","EUVD-2021-0502","GHSA-fxwf-4rqh-v8g3"],"status":"published","title":"Insecure Defaults","description":"The package socket.io before 2.4.0 are vulnerable to Insecure Defaults due to CORS Misconfiguration. All domains are whitelisted by default.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00745,"percentile":0.55056,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-346","CWE-453"],"published":"2021-01-19T14:45:17Z","modified":"2026-11-05T05:36:30Z","fixes":[{"ecosystem":"npm","package":"socket.io","fixed_in":["2.4.0"],"sources":["ghsa","osv"]},{"ecosystem":"TuxCare:npm","package":"socket.io","fixed_in":["2.1.1-tuxcare.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"socket.io","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.0"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"js-jquery","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.5.0-4"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"socket.io","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.1.1-tuxcare.0"},{"fixed":"2.1.1-tuxcare.1"}]}],"versions":["2.1.1"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"socket.io","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.4-tuxcare.0"},{"fixed":"2.0.4-tuxcare.1"}]}],"versions":["2.0.4"],"bundled":2},{"source":"osv","ecosystem":"TuxCare:npm","package":"socket.io","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.7.4-tuxcare.0"},{"fixed":"1.7.4-tuxcare.1"}]}],"versions":["1.7.4"],"bundled":2},{"source":"osv","ecosystem":"TuxCare:npm","package":"socket.io","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.7.3-tuxcare.0"},{"fixed":"1.7.3-tuxcare.1"}]}],"versions":["1.7.3"],"bundled":2},{"source":"osv","ecosystem":"npm","package":"socket.io","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.4.0"}]}]}],"products":[{"vendor":"socket","product":"socket.io"},{"vendor":"socketio","product":"socket.io"}],"references":[{"url":"https://snyk.io/vuln/SNYK-JS-SOCKETIO-1024859","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1056357","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1056358","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://github.com/socketio/socket.io/issues/3671","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-28481","tags":["web","advisory"]},{"url":"https://github.com/socketio/socket.io/commit/f78a575f66ab693c3ea96ea88429ddb1a44c86c7","tags":["web"]},{"url":"https://github.com/advisories/GHSA-fxwf-4rqh-v8g3"}],"sources":{"cve":[{"id":"CVE-2020-28481","title":"Insecure Defaults","description":"The package socket.io before 2.4.0 are vulnerable to Insecure Defaults due to CORS Misconfiguration. All domains are whitelisted by default.","status":"published","published":"2021-01-19T14:45:17.064Z","modified":"2024-09-16T20:11:33.987Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:35:57.017407Z"}],"euvd":[{"id":"EUVD-2021-0502","description":"The package socket.io before 2.4.0 are vulnerable to Insecure Defaults due to CORS Misconfiguration. All domains are whitelisted by default.","status":"published","published":"2021-01-19T14:45:17Z","modified":"2024-09-16T20:11:33Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-03T00:55:16.297064Z"}],"ghsa":[{"id":"GHSA-fxwf-4rqh-v8g3","title":"CORS misconfiguration in socket.io","description":"The package socket.io before 2.4.0 are vulnerable to Insecure Defaults due to CORS Misconfiguration. 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All domains are whitelisted by default.","status":"published","published":"2021-01-19T15:15:12Z","modified":"2026-11-05T05:36:30Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-05T16:41:20.107976Z"},{"id":"CVE-2020-28481","description":"The package socket.io before 2.4.0 are vulnerable to Insecure Defaults due to CORS Misconfiguration. All domains are whitelisted by default.","status":"published","published":"2021-01-19T15:15:12.06Z","modified":"2026-10-20T10:54:19.446474158Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:16.248747Z"},{"id":"GHSA-fxwf-4rqh-v8g3","title":"CORS misconfiguration in socket.io","description":"The package socket.io before 2.4.0 are vulnerable to Insecure Defaults due to CORS Misconfiguration. 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