Description
The package trailing-slash before 2.0.1 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as https://example.com//attacker.example/). The vulnerable code is in index.js::createTrailing(), as the web server uses relative URLs instead of absolute URLs.
Remediation
References
https://github.com/fardog/trailing-slash/blob/f640ece055fe85275c983de5eb94661b95e35670/index.js%23L36
https://snyk.io/vuln/SNYK-JS-TRAILINGSLASH-1085707
https://github.com/fardog/trailing-slash/commit/f8e66f1429308247e5a119d430203077d8f05048