Authenticated Remote Code Execution in CMSimple by CMSimple
CVE-2021-47735

8.6HIGH

Key Information:

Vendor

Cmsimple

Status
Cmsimple
Vendor
CVE Published:
23 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47735?

CMSimple 5.4 is susceptible to an authenticated remote code execution vulnerability that enables authenticated attackers to inject malicious PHP code via the template editing feature. By exploiting this vulnerability, attackers can create and execute reverse shell payloads by manipulating the template editing endpoint with a valid CSRF token, potentially compromising the integrity of the affected web application and its server.

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Affected Version(s)

Cmsimple 5.4

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47735 - Proof of Concept

References

https://www.exploit-db.com/exploits/50356
exploit
https://www.cmsimple.org/
product
https://www.vulncheck.com/advisories/cmsimple-authenticat...
third-party-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

pussycat0x
JSON
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