Authenticated Remote Code Execution in Textpattern by Textpattern
CVE-2021-47888

8.7HIGH

Key Information:

Vendor

The Textpattern Development Team

Status
Textpattern
Vendor
CVE Published:
23 January 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47888?

Certain versions of Textpattern prior to 4.8.3 are susceptible to an authenticated remote code execution vulnerability. This flaw allows authenticated users to upload malicious PHP files, potentially enabling attackers to execute arbitrary commands on the server. By exploiting this weakness, an attacker can craft a PHP file containing a shell command and trigger it by accessing the uploaded file through a specific URL parameter. It is crucial for users to upgrade to the patched version or apply appropriate security measures to mitigate this risk.

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Affected Version(s)

Textpattern 4.8.3

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-2021-47888 - Proof of Concept

References

https://www.exploit-db.com/exploits/49620
exploit
https://textpattern.com/
product
https://textpattern.com/start
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

Ricardo Ruiz (@ricardojoserf)
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