OctoberCMS v3.4.0 (Category) Stored Cross-Site Scripting Vulnerability
Vendor: October CMS
Product web page: https://www.octobercms.com
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 a category-creating feature that stores
data persistently could create a stored XSS attack against any other users
visiting the blog 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)
           PHP/8.1.6
Vulnerability discovered by Nazli Soysal Kuran
                            @zeroscience
Advisory ID: ZSL-2023-5806
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2023-5806.php
30.10.2023
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Stored XSS (EntryRecord[title]):
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Endpoint: POST /backend/tailor/entries/blog_category/create
Payload: EntryRecord%5Btitle%5D="</title><script>alert(1)</script>"