CVE-2021-47736CWE-94

CMSimple_XH 1.7.4 Authenticated Remote Code Execution via Content Editing

High · published December 23, 2025

CVSS v4.0
8.6
EPSS
1%
Percentile
64.7
In the wild
Unconfirmed
What it is

⚡ An attacker with valid credentials can turn your CMSimple_XH 1.7.4 into their personal playground! This authenticated remote code execution vulnerability lets them upload malicious PHP files and execute commands at will. 😱 Think of it like a hotel manager who accidentally gave a guest the master key — suddenly, that guest can open every door and throw a wild party! This vulnerability allows attackers to upload their own scripts and take control of the server as if they were the rightful admin. If exploited, attackers could execute arbitrary commands on your server, leading to data theft, manipulation of website content, or complete server takeover. The consequences could be absolutely devastating for your organization and your users. 🚨

Put simply

Think of it like a hotel manager who accidentally gave a guest the master key — suddenly, that guest can open every door and throw a wild party! This vulnerability allows attackers to upload their own scripts and take control of the server as if they were the rightful admin. This vulnerability arises from improper handling of CSRF tokens, allowing authenticated users to upload malicious PHP files through the content editing feature of CMSimple_XH. Once uploaded, these files can be executed remotely by the attacker, compromising the entire server.

What to do

If exploited, attackers could execute arbitrary commands on your server, leading to data theft, manipulation of website content, or complete server takeover. The consequences could be absolutely devastating for your organization and your users. 🚨 To protect your application, patch CMSimple_XH to version 1.7.5 or later immediately. Additionally, review user access permissions and ensure proper validation of file uploads to prevent unauthorized file types. 🛡️ You can tackle this! Follow these steps to secure your system and keep those rogue attacks at bay. You've got this! 💪✨

The record
Technical detail
CVSS v4.0
8.6 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.01077 · 64.7th percentile
Weakness
CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2025-12-23T19:34Z
EPSS history
Timeline
  • 23 DEC 19:34Z
    CMSimple_XH 1.7.4 Authenticated Remote Code Execution via Content Editing
    cvelistv5