The package koa-remove-trailing-slashes before 2.0.2 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::removeTrailingSlashes(), as the web server uses relative URLs instead of absolute URLs.
{
"github_reviewed": true,
"severity": "MODERATE",
"cwe_ids": [
"CWE-601"
],
"nvd_published_at": "2021-05-17T18:15:00Z",
"github_reviewed_at": "2021-05-19T17:57:27Z"
}