Description

Stored Cross-Site Scripting (XSS) vulnerability due to the lack of content validation and output encoding. Then, the vulnerability can be triggered when the user previews the document´s content.

Proof of Concept

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https://drive.google.com/file/d/1hBAFUZODeb1mjC_2prlJK3JoKzhyWotA/view?usp=sharing

Impact

Stored XSS generally occurs when user input is stored on the target server, such as in a database, in a message forum, visitor log, comment field, etc. And then a victim is able to retrieve the stored data from the web application without that data being made safe to render in the browser.