{"cve":"CVE-2020-11020","nvd":{"published":"2020-04-29T18:15:13.360","modified":"2026-06-17T02:48:52.360","status":"Modified","description":"Faye (NPM, RubyGem) versions greater than 0.5.0 and before 1.0.4, 1.1.3 and 1.2.5, has the potential for authentication bypass in the extension system. The vulnerability allows any client to bypass checks put in place by server-side extensions, by appending extra segments to the message channel. It is patched in versions 1.0.4, 1.1.3 and 1.2.5.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-287"],"references":["https://github.com/faye/faye/commit/65d297d341b607f3cb0b5fa6021a625a991cc30e","https://github.com/faye/faye/security/advisories/GHSA-qpg4-4w7w-2mq5","https://github.com/faye/faye/commit/65d297d341b607f3cb0b5fa6021a625a991cc30e","https://github.com/faye/faye/security/advisories/GHSA-qpg4-4w7w-2mq5"],"products":["faye_project:faye"],"source":"nvd","synced_at":"2026-10-19T21:04:18.695612450+00:00"},"epss":{"cve":"CVE-2020-11020","score":0.01573,"percentile":0.75414,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-qpg4-4w7w-2mq5","url":"https://osv.dev/vulnerability/GHSA-qpg4-4w7w-2mq5","summary":"Authentication and extension bypass in Faye","modified":"2026-09-10T03:48:43.957975862Z","packages":[{"ecosystem":"RubyGems","name":"faye","purl":"pkg:gem/faye","ranges":[">=0.5.0 <1.0.4"],"fixed":["1.0.4"]},{"ecosystem":"RubyGems","name":"faye","purl":"pkg:gem/faye","ranges":[">=1.1.0 <1.1.3"],"fixed":["1.1.3"]},{"ecosystem":"RubyGems","name":"faye","purl":"pkg:gem/faye","ranges":[">=1.2.0 <1.2.5"],"fixed":["1.2.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}