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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.

PUBLISHED Reserved 2026-05-16 | Published 2026-05-16 | Updated 2026-05-18 | Assigner VulnCheck




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem types

Cross-Site Request Forgery (CSRF)

Product status

4.9.0-dev
affected

Credits

Mevlüt Akçam finder

References

www.exploit-db.com/exploits/50095 (ExploitDB-50095) exploit

textpattern.com/ (Official Product Homepage) product

github.com/textpattern/textpattern (Product Reference) product

www.vulncheck.com/...remote-code-execution-via-plugin-upload (VulnCheck Advisory: TextPattern CMS 4.9.0-dev Authenticated Remote Code Execution via Plugin Upload) third-party-advisory

cve.org (CVE-2021-47976)

nvd.nist.gov (CVE-2021-47976)

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