Overly permissive cross-domain whitelist in Python Engine.IO - CVE-2019-13611
Published: July 17, 2019 / Updated: May 25, 2026
Vulnerability identifier: #VU19229
CSH Severity: Low
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-13611
CWE-ID: CWE-942
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass the CORS protection mechanism.
The vulnerability exists due to incorrect processing of the "Origin" HTTP header that is supplied within HTTP request. A remote attacker can supply arbitrary value via the "Origin" HTTP header, bypass implemented CORS protection mechanism and perform Cross-Site WebSocket Hijacking (CSWSH) attacks against the vulnerable application.
Affected software
Python Engine.IO
How to mitigate CVE-2019-13611
Install update from vendor's website.
Python Engine.IO - update to 3.9.0