CVE-2021-47735
HIGH EPSS 50.6%
Published Dec 23, 20256mo ago · Modified Jun 17, 20261w ago
8.6 CVSS 4.0
Published Dec 23, 2025 6mo ago
Last Modified Jun 17, 2026 1w ago
Description
CMSimple 5.4 contains an authenticated remote code execution vulnerability that allows logged-in attackers to inject malicious PHP code into template files. Attackers can exploit the template editing functionality by crafting a reverse shell payload and saving it through the template editing endpoint with a valid CSRF token.
CVSS Details
Base Score
Exploitability
Impact
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
50.6% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available
Weaknesses 1
CWE-94 Improper Control of Generation of Code (Code Injection) Injection
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| cmsimple | cmsimple | 5.4 | any |
References 3
- cmsimple.org https://www.cmsimple.org/
- exploit-db.com https://www.exploit-db.com/exploits/50356
- vulncheck.com https://www.vulncheck.com/advisories/cmsimple-authenticated-remote-code-execution-via-template-editing
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.