CVE-2021-47976 - CVE House
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Status published High CVE-2021-47976

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

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Mevlüt Akçam

Affected Vendor

Textpattern

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Affected Software

TextPattern CMS
Vulnerable Versions:
4.9.0-dev

Timeline

Official Publish: May 16th, 2026
Last Modified: May 18th, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)