Authenticated Local File Inclusion in CMSimple by CMSimple GmbH
CVE-2021-47734

8.6HIGH

Key Information:

Vendor

Cmsimple

Status
Cmsimple
Vendor
CVE Published:
23 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47734?

CMSimple version 5.4 is affected by an authenticated local file inclusion vulnerability that enables remote attackers to manipulate PHP session files. By altering the file path used by functions, attackers can upload malicious PHP code through session file upload mechanisms, potentially executing arbitrary code on the server. This vulnerability poses a significant risk to the integrity and security of CMSimple installations.

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Affected Version(s)

CMSimple 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-2021-47734 - Proof of Concept

References

https://www.exploit-db.com/exploits/50547
exploit
https://www.cmsimple.org/en/
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

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