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Joomla! versions prior to 3.9.17 contain an improper input validation vulnerability in the usergroup table class. This flaw allows attackers to manipulate input in a way that can result in a broken Access Control List (ACL) configuration, potentially undermining the intended security boundaries enforced by the CMS.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a working exploit for CVE-2020-11890, a vulnerability in Joomla core before version 3.9.17 that allows an attacker with administrator (but not superadmin) credentials to escalate privileges and achieve remote code execution (RCE). The repository consists of a Python script (cve202011890.py) and a README.md file. The exploit script automates the following steps: logs in as an administrator, manipulates user groups to escalate privileges, creates a new superadmin user, and uploads a PHP webshell to the server. The webshell allows arbitrary command execution via HTTP requests. The script interacts with several Joomla administrative endpoints to perform these actions. The README provides usage instructions, affected versions, and example credentials for testing. The exploit is operational and provides a real, working payload (PHP webshell) for post-exploitation.
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