rsjoomla.com RSFiles Extension For Joomla - Arbitrary File Upload (CVE-2026-57827)
Description
Joomla Extension - rsjoomla.com - Unauthenticated file upload in RSFiles component < 1.17.12 - The Joomla extension RSFiles is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.
psychologyCrowdSec Analysis
CVE-2026-57827 is a critical unauthenticated arbitrary file upload vulnerability in the Rsjoomla.com RSFiles Extension For Joomla versions before 1.17.12. Remote attackers can upload executable files without authentication, potentially achieving full remote code execution and compromising the affected Joomla server.
CrowdSec has been tracking this vulnerability and its exploits since 25th of August 2026.
CrowdSec has not observed any significant exploitation activity targeting CVE-2026-57827 across its network. As a result, no community-driven trend analysis is available for this vulnerability at this time.
Attackers target Joomla’s RSFiles! component endpoints /index.php?option=com_rsfiles&task=rsfiles.checkupload and rsfiles.upload to bypass authentication and upload executable PHP files. They may then request the uploaded payload under /downloads/<filename>.php to achieve unauthenticated remote code execution.
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| Event | Date |
|---|---|
| CVE Published | 2026-07-11 |
| Rule Released | 2026-08-25 |
| CrowdSec First Seen | 2026-08-28 |