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Description

Textpattern versions prior to 4.8.3 contain an authenticated remote code execution vulnerability that allows logged-in users to upload malicious PHP files. Attackers can upload a PHP file with a shell command execution payload and execute arbitrary commands by accessing the uploaded file through a specific URL parameter.

PUBLISHED Reserved 2026-01-18 | Published 2026-01-23 | Updated 2026-01-23 | 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

Unrestricted Upload of File with Dangerous Type

Product status

4.8.3
affected

Credits

Ricardo Ruiz (@ricardojoserf) finder

References

www.exploit-db.com/exploits/49620 exploit

www.exploit-db.com/exploits/49620 (ExploitDB-49620) exploit

textpattern.com/ (Official Vendor Homepage) product

textpattern.com/start (Textpattern Software Download Page) product

www.vulncheck.com/...ories/textpattern-remote-code-execution (VulnCheck Advisory: Textpattern 4.8.3 - Remote code execution) third-party-advisory

cve.org (CVE-2021-47888)

nvd.nist.gov (CVE-2021-47888)

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