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Vulnerability record · CVE-2021-47888 · published 23 January 2026

CVE-2021-47888: Unrestricted file upload vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.70% · top 48.8% CWE-434 · Unrestricted file upload Deferred
8.7CVSS 4.0 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://textpattern.com/
https://textpattern.com/start
https://www.exploit-db.com/exploits/49620
https://www.vulncheck.com/advisories/textpattern-remote-code-execution
https://www.exploit-db.com/exploits/49620

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Source: NIST National Vulnerability Database (record CVE-2021-47888), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.