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A reflected cross-site scripting (XSS) vulnerability exists in GetSimple CMS version 3.3.16, specifically in the admin/index.php login portal. The vulnerability allows remote attackers to inject and execute arbitrary JavaScript code in the context of the victim's browser if the victim clicks a crafted link, enters credentials, and submits the login form. This can be exploited to steal login credentials or perform other malicious actions in the context of the authenticated user.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains two Python exploit scripts targeting CVE-2020-23839, a Reflected XSS vulnerability in GetSimple CMS v3.3.16. The first script (CredHarvesterEdition) focuses on credential harvesting via a crafted XSS payload, while the second (RceEdition) demonstrates a full attack chain leading to remote code execution. Both scripts generate a malicious URL that, when visited by an admin and used to log in, triggers a JavaScript payload. This payload logs in as the admin, retrieves necessary tokens, and injects a PHP webshell into the CMS theme via the /admin/theme-edit.php endpoint. The attacker can then interact with the webshell through HTTP POST requests, achieving arbitrary command execution on the server. The exploit requires social engineering to lure an admin to the crafted URL. The repository is well-documented, with a README explaining the vulnerability, attack chain, and references. No detection scripts or fake code are present; both scripts are functional exploits.
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