In actionpack gem >= 6.0.0, a possible XSS vulnerability exists when an application is running in development mode allowing an attacker to send or embed (in another page) a specially crafted URL which can allow the attacker to execute JavaScript in the context of the local application. This vulnerability is in the Actionable Exceptions middleware.
[
{
"product": "https://github.com/rails/rails",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "6.0.3.4"
}
]
}
]