OctoberCMS v3.4.0 (About) Stored Cross-Site Scripting Vulnerability  
Vendor: October CMS  
Product web page:  
Affected version: 3.4.0  
Summary: OctoberCMS is a self-hosted content management system (CMS)  
based on the PHP programming language and Laravel web application framework.  
It supports MySQL, SQLite and PostgreSQL for the database back end and  
uses a flat file database for the front end structure. The October CMS  
covers a range of capabilities such as users, permissions, themes, and  
plugins, and is seen as a simpler alternative to WordPress.  
Desc: OctoberCMS suffers from stored cross-site scripting vulnerability  
when a user with the ability to edit the landing/about page. This can  
lead to execute arbitrary HTML/JS code in a user's browser session in  
context of an affected site.  
Tested on: macOS Monterey 12.6.3  
Docker 4.12.0 (85629)  
Vulnerability discovered by Nazli Soysal Kuran  
Advisory ID: ZSL-2023-5803  
Advisory URL:  
Stored XSS (EntryRecord[blocks][1][content]):  
Endpoint: POST /backend/tailor/entries/landing_page  
Payload: EntryRecord%5Bblocks%5D%5B1%5D%5Bcontent%5D="<script>alert(1)</script>"