{"id":"CVE-2019-13611","aliases":["GHSA-j3jp-gvr5-7hwq","PYSEC-2019-170"],"url":"https://o3.security/vulnerability/CVE-2019-13611","summary":"python-engineio vulnerable to Cross-Site Request Forgery (CSRF) ","details":"## WebSocket cross-origin vulnerability\n\n### Impact\nThis is a Cross-Site Request Forgery (CSRF) vulnerability. It affects Socket.IO and Engine.IO web servers that authenticate clients using cookies.\n\n### Patches\npython-engineio version 3.9.0 patches this vulnerability by adding server-side Origin header checks.\n\n### Workarounds\nDo not use cookies for client authentication, or else add a CSRF token to the connection URL.\n\n### References\nhttps://www.owasp.org/index.php/Cross-Site_Request_Forgery_(CSRF)\nhttps://www.christian-schneider.net/CrossSiteWebSocketHijacking.html\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [python-engineio](http://github.com/miguelgrinberg/python-engineio)","published":"2019-07-16T00:15:10.837Z","modified":"2026-07-08T16:27:23.171426Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":{"score":0.00853,"percentile":0.55909,"asOf":"2026-09-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"python-engineio","fixedVersion":"3.9.0"}],"fix":null,"references":[{"type":"FIX","url":"https://github.com/miguelgrinberg/python-engineio/issues/128"},{"type":"WEB","url":"https://github.com/miguelgrinberg/python-engineio/security/advisories/GHSA-j3jp-gvr5-7hwq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-13611"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-j3jp-gvr5-7hwq"},{"type":"PACKAGE","url":"https://github.com/miguelgrinberg/python-engineio"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/python-engineio/PYSEC-2019-170.yaml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T16:27:23.171426Z"}}