CVE-2021-47976

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

Published May 16, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title TextPattern CMS 4.9.0-dev Authenticated Remote Code Execution via Plugin Upload
First Time appeared Textpattern
Textpattern textpattern
Weaknesses CWE-352
CPEs cpe:2.3:a:textpattern:textpattern:4.9.0-dev:*:*:*:*:*:*:*
cpe:2.3:a:textpattern:textpattern:4.9.0:-:*:*:*:*:*:*
cpe:2.3:a:textpattern:textpattern:4.9.0:beta1:*:*:*:*:*:*
cpe:2.3:a:textpattern:textpattern:4.9.0:beta1a:*:*:*:*:*:*
cpe:2.3:a:textpattern:textpattern:4.9.0:beta2:*:*:*:*:*:*
cpe:2.3:a:textpattern:textpattern:4.9.0:beta:*:*:*:*:*:*
Vendors & Products Textpattern
Textpattern textpattern
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
May 18, 2026, 4:50 PM
Reserved
May 16, 2026, 2:41 PM
Status
Deferred
Published
May 16, 2026, 4:16 PM
Modified
Jun 17, 2026, 4:18 AM