Remote Code Execution Vulnerability in TextPattern CMS by TextPattern
CVE-2021-47976

8.7HIGH

Key Information:

Vendor

Textpattern

Status
Textpattern Cms
Vendor
CVE Published:
16 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47976?

TextPattern CMS 4.9.0-dev has a vulnerability that enables authenticated attackers to exploit the plugin upload capability. By obtaining a CSRF token from the plugin event page, attackers can upload arbitrary PHP files to the 'textpattern/tmp/' directory, compromising server integrity and allowing for unauthorized code execution. This vulnerability poses significant risks if not mitigated, as it opens pathways for attackers to execute malicious scripts on the affected server.

Affected Version(s)

TextPattern CMS 4.9.0-dev

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-2021-47976 - Proof of Concept

References

https://www.exploit-db.com/exploits/50095
exploit
https://textpattern.com/
product
https://github.com/textpattern/textpattern
product

CVSS V4

Score:
8.7
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

Mevlüt Akçam
.