WordPress Contact Form 7 before 5.3.2 allows unrestricted file upload and remote code execution because a filename may contain special characters.
View the template here CVE-2020-35489.yaml
References:
https://web.archive.org/web/20210125141546/https://www.getastra.com/blog/911/plugin-exploit/contact-form-7-unrestricted-file-upload-vulnerability/