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CVE-2026-49049 – Unauthenticated File Deletion & Arbitrary Write – Helix3 Extension for Joomla (v…

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Summary

CVE-2026-49049 is a high-severity Improper Access Control vulnerability (CWE-284) affecting the Helix3 template framework extension for Joomla, developed by JoomShaper. The flaw allows completely unauthenticated, remote attackers to delete arbitrary files, write arbitrary JSON files, and modify template parameters on any internet-exposed Joomla site running the affected plugin. With a CVSS v3.1 score of 7.5 (HIGH) and no patch available as of the publication date, all sites running Helix3 versions 1.0 through 3.1.1 are exposed.

Technical details

  • Root cause: The Helix3 plugin exposes an AJAX handler task that performs sensitive file-system and configuration operations without enforcing any authentication or authorization checks (CWE-284: Improper Access Control).
  • Trigger conditions: Any network-reachable HTTP request to the vulnerable AJAX handler endpoint is sufficient to trigger the vulnerability — no credentials, valid session, or user interaction are required.
  • Attack vector: Network-accessible; low attack complexity; no privileges required; no user interaction needed (AV:N/AC:L/PR:N/UI:N).
  • Impact:
    • Arbitrary file deletion — attackers can remove files on the server, potentially destroying site functionality or triggering secondary failures.
    • Arbitrary JSON file write — attackers can create or overwrite JSON files, including configuration files, which may enable persistent backdoors or privilege escalation.
    • Template parameter tampering — attackers can update template configuration parameters without authentication.

Affected software

  • Helix3 extension for Joomla — all versions from 1.0 through 3.1.1 (inclusive)
  • Vendor: JoomShaper (joomshaper.com)

Severity

  • CVSS v3.1 Base Score: 7.5 (HIGH)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Mitigation and recommended actions

  • No vendor patch is available as of June 29, 2026. The CVE record does not reference a fixed version, and no new Helix3 release addressing this issue has been published by JoomShaper.
  • Immediate workarounds:
    • Disable the Helix3 plugin on any Joomla site not actively requiring it until an official fix is released.
    • Restrict access to the AJAX handler endpoint at the web server or WAF level, blocking unauthenticated requests to the Helix3 task handler from untrusted IP ranges.
    • Monitor server file-system integrity using file integrity monitoring (FIM) tools to detect unauthorized file creation, deletion, or modification in the Joomla web root.
    • Review and harden Joomla directory permissions to limit the impact of any file-write attempts.
  • Monitor the JoomShaper Helix3 release page for a patched version and apply it immediately upon release.

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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