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CVE-2026-102427 – Unauthenticated RCE via Arbitrary File Upload – OrdaSoft Joomla CCK ≤ 8.3.15

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Summary

CVE-2026-102427 is a critical unrestricted file upload vulnerability (CWE-434) in the OrdaSoft Joomla CCK extension (com_os_cck) that allows a fully unauthenticated attacker to upload a PHP script and achieve remote code execution on the underlying web server. The flaw affects versions 1.0.0 through 8.3.15 and carries a maximum CVSS score of 10.0. Any internet-facing Joomla site with this extension installed is exposed to complete compromise without any login or user interaction.

Technical details

  • The component’s frontend routing exposes the task=getContent action, which reaches site/uploader.php with no authentication or access-control check anywhere in the dispatch chain.
  • The handler performs a genuine magic-byte/MIME check on uploaded content, but the extension allow-list intended to restrict which file extensions could be saved was present in the source code but commented out.
  • The saved file’s extension is taken directly from the attacker-supplied filename with no validation, and the file is written to a path under the Joomla web root that PHP executes.
  • An attacker crafts an image/PHP polyglot file — one whose header bytes satisfy the MIME check while PHP source is appended afterward — and uploads it with a .php extension of their choosing, bypassing the intended restriction entirely.
  • Attack vector is network-based, requires low complexity, no privileges, and no user interaction, resulting in full compromise of confidentiality, integrity, and availability of the host.

Affected software

  • OrdaSoft Joomla CCK extension (com_os_cck), versions 1.0.0 through 8.3.15
  • Fixed in version 8.3.16 and later

Severity

  • CVSS v4.0 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

Mitigation and recommended actions

  • Immediate: Upgrade OrdaSoft Joomla CCK (com_os_cck) to version 8.3.16 or later, which restores the file extension allow-list and closes the upload path.
  • If immediate patching is not possible:
    • Restrict or block external access to the site/uploader.php endpoint and the task=getContent route at the web server or WAF layer until patched.
    • Review the web root and any upload directories used by the extension for unexpected .php files or other executable content that may indicate prior exploitation.
    • Disable or temporarily remove the OrdaSoft CCK component if it is not business-critical, pending the update.

References

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