CVE-2021-47735
CMSimple 5.4 Authenticated Remote Code Execution via Template Editing
- State
- Published
- Severity
- 8.6 High
- Published
- Dec 23, 2025
- Updated
- Mar 5, 2026
- Reserved
- Dec 23, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.6 High | 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 | VulnCheck |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-94 Improper Control of Generation of Code ('Code Injection')
Affected Products
| Product | Versions |
|---|---|
CmsimpleCmsimple |
|
References
- ExploitDB-50356exploit
- Official CMSimple Homepageproduct
- VulnCheck Advisory: CMSimple 5.4 Authenticated Remote Code Execution via Template Editingthird-party-advisory
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