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CVE-2026-61424 – Unauthenticated File Upload Leading to RCE – DJ-Classifieds for Joomla (up to 3….

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Summary

CVE-2026-61424 is a critical unauthenticated arbitrary file upload vulnerability (CWE-434) in the DJ-Classifieds extension for Joomla, developed by dj-extensions.com, affecting all versions from 1.0 through 3.11.1. The flaw allows any unauthenticated remote attacker to upload a malicious file to the server, leading to Remote Code Execution (RCE), and carries a maximum CVSS 4.0 score of 10.0. A patch was released on July 20, 2026 in version 3.11.2, and the extension has been unpublished from the Joomla Extension Directory pending resolution.

Technical details

  • Root cause: The upload() method in administrator/components/com_djclassifieds/lib/djupload.php processes file uploads with no authentication check and no CSRF or session token validation. The component’s content-filtering logic only blocks three literal PHP strings — <?php, eval(, and base64 — allowing payloads using PHP short tags (e.g., <?=system($_GET['c']);?>) to bypass the filter entirely.
  • Trigger conditions: An attacker submits a crafted HTTP POST request to the endpoint index.php?option=com_djclassifieds&task=imageupload. No login, token, or prior interaction is required.
  • Attack vector: Network-accessible, no authentication, no user interaction required, low attack complexity.
  • Impact: Successful exploitation enables an attacker to upload attacker-controlled PHP code to the target server. Execution of that code — and full server compromise — follows on hosts where uploaded files are served from a web-accessible path. The open endpoint also exposes sites to secondary risks including disk exhaustion and content abuse.

Affected software

  • DJ-Classifieds extension for Joomla — all versions from 1.0 through 3.11.1

Severity

  • CVSS 4.0 Base Score: 10.0 (Critical)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
  • CWE: CWE-434 – Unrestricted Upload of File with Dangerous Type

Mitigation and recommended actions

  • Immediate: Upgrade DJ-Classifieds to version 3.11.2 (released July 20, 2026). This release adds authentication and CSRF/session validation to the imageupload endpoint and enforces a server-side image-only allowlist, restricting accepted file types to jpg, jpeg, png, and gif.
  • If immediate patching is not possible: Block unauthenticated access to the index.php?option=com_djclassifieds&task=imageupload endpoint at the web server or WAF layer to prevent exploitation until the update can be applied.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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