Language: Go
Label: vulnerable
CWE: CWE-287 \u2014 Improper Authentication
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Code:
func authentication(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		authenticationHandler(w, r)
		next.ServeHTTP(w, r)
	})
}