Vulnerability · Published Dec 23, 2025 · Assigned by VulnCheck
CVE-2021-47735CMSimple 5.4 Authenticated Remote Code Execution via Template Editing
High 8.8
In plain English
A high-severity code injection in Cmsimple from Cmsimple. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.9%top 40.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- ExploitDB-50356 exploit
- Official CMSimple Homepage product
- VulnCheck Advisory: CMSimple 5.4 Authenticated Remote Code Execution via Template Editing third-party-advisory