C# False Positive Suggestion PathBase

**Description of the false positive**

Context.Request.PathBase should not be included as a Remote Flow Source. From my understanding of PathBase, PathBase is usually decided by the server/proxy and therefore is not controllable by a user, but a requirement for accessing an endpoint. Below is an alert I received from the C# XSS query that took PathBase as its source.

**Code samples or links to source code**

```csharp
var bundleAsset = GetOrCreateBundle(bundleKey, CreateCssAsset, sources);

var pathBase = _actionContextAccessor.ActionContext?.HttpContext.Request.PathBase ?? PathString.Empty; <--- PathBase here
result.AppendFormat("",
MimeTypes.TextCss, pathBase, bundleAsset.Route, bundleAsset.GenerateCacheKey(httpContext, woConfig));
```

Start with the C# XSS query and its modeling of Context.Request.PathBase as a Remote Flow Source. Confirm how PathBase is classified, then verify that the shown value is no longer treated as a source; the issue provides no file or test path, so repository search is needed.

Written by the indexing model from the issue text.