Language: Python
Label: vulnerable
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
    def render(self, record, value):  # pylint: disable=arguments-differ
        if value:
            url = reverse(self.viewname, kwargs=self.view_kwargs)
            if self.url_params:
                url += "?" + "&".join([f"{k}={getattr(record, v)}" for k, v in self.url_params.items()])
            return mark_safe(f'<a href="{url}">{value}</a>')
        return value