A cross-site scripting (XSS) vulnerability in flaskBlog v2.6.1 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the postContent parameter at /createpost.
https://github.com/DogukanUrker/flaskBlog/issues/130
https://gist.github.com/coleak2021/edbd6e0766227ee96a7a4601e50773eb