High · published December 11, 2025
⚡ An authenticated attacker can exploit CMSimple 5.15 to upload malicious PHP files with a simple extension twist! 🔥 Think of it like a sneaky guest at a hotel who changes their room number to access the penthouse. Here, the attacker is modifying file extensions to get past security checks and unleash a shell script that's free to roam! If exploited, an attacker could execute arbitrary code on the server, potentially leading to complete control over the web application. This could result in data leaks, unauthorized access to sensitive information, or even the destruction of critical files. It's an invasion that could leave your server compromised and your data exposed!
Think of it like a sneaky guest at a hotel who changes their room number to access the penthouse. Here, the attacker is modifying file extensions to get past security checks and unleash a shell script that's free to roam! This remote command execution vulnerability arises when CMSimple accepts altered file extensions, allowing attackers to upload PHP scripts disguised as regular files. By appending ',php' to the user file extensions, they can effectively bypass security measures and execute their code.
If exploited, an attacker could execute arbitrary code on the server, potentially leading to complete control over the web application. This could result in data leaks, unauthorized access to sensitive information, or even the destruction of critical files. It's an invasion that could leave your server compromised and your data exposed! Immediate steps include patching CMSimple to version 5.16, restricting file uploads to safe formats, and reviewing user permissions. It's crucial to audit uploaded files regularly to catch any malicious content before it can do harm! You've got this! By taking these actions, you can protect your server and boost your security hero status! 🛡️
| Product | Versions | Fixed in |
|---|---|---|
| cmsimple/cmsimple | all versions | — |