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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Textpattern TextPattern CMS affected
Version Status Constraints
4.9.0-dev affected —

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Project Subscriptions

Vendors Products
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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/textpattern/textpattern cve-icon cve-icon
https://textpattern.com/ cve-icon cve-icon
https://www.exploit-db.com/exploits/50095 cve-icon cve-icon
https://www.vulncheck.com/advisories/textpattern-cms-dev-authenticated-remote-code-execution-via-plugin-upload cve-icon cve-icon
History

Sat, 16 May 2026 15:45:00 +0000

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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-05-16T15:26:16.409Z

Reserved: 2026-05-16T14:41:11.033Z

Link: CVE-2021-47976

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-16T16:16:23.107

Modified: 2026-05-16T16:16:23.107

Link: CVE-2021-47976

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-16T16:30:27Z

Weaknesses