CVE-2021-47976

HIGH

TextPattern CMS 4.9.0-dev Authenticated Remote Code Execution via Plugin Upload

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-47976. PoCs published by Mevlüt Akçam.

AI-analyzed exploit summary This exploit demonstrates an authenticated RCE vulnerability in TextPattern CMS 4.9.0-dev by uploading a malicious PHP plugin file via the plugin upload functionality. The exploit uses a valid session token and authenticated user credentials to bypass security checks.

Description

TextPattern CMS 4.9.0-dev contains a remote code execution vulnerability that allows authenticated attackers to upload arbitrary PHP files by exploiting the plugin upload functionality. Attackers can authenticate, retrieve a CSRF token from the plugin event page, and upload malicious PHP files to the textpattern/tmp/ directory for code execution.

Exploits (1)

exploitdb WORKING POC
by Mevlüt Akçam · pythonwebappsphp
https://www.exploit-db.com/exploits/50095

This exploit demonstrates an authenticated RCE vulnerability in TextPattern CMS 4.9.0-dev by uploading a malicious PHP plugin file via the plugin upload functionality. The exploit uses a valid session token and authenticated user credentials to bypass security checks.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: TextPattern CMS 4.9.0-dev
Auth required
Prerequisites: valid user credentials · access to the plugin upload feature
devstral-2 · analyzed May 16, 2026 Full analysis →

References (4)

Core 4
Core References
Exploit exploit
ExploitDB-50095
https://www.exploit-db.com/exploits/50095
Product product
Official Product Homepage
https://textpattern.com/
Product product
Product Reference
https://github.com/textpattern/textpattern
Third Party Advisory third-party-advisory
VulnCheck Advisory: TextPattern CMS 4.9.0-dev Authenticated Remote Code Execution via Plugin Upload
https://www.vulncheck.com/advisories/textpattern-cms-dev-authenticated-remote-code-execution-via-plugin-upload

Scores

CVSS v3 8.8
EPSS 0.0032
EPSS Percentile 23.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-352
Status published
Products (1)
Textpattern/TextPattern CMS 4.9.0-dev
Published May 16, 2026
Tracked Since May 16, 2026