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CVE-2026-65887 – Unauthenticated Arbitrary Password Reset / Account Takeover – Gridbox Extension …

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Summary

CVE-2026-65887 is a critical improper access control vulnerability (CWE-284) in the Gridbox page-builder extension for Joomla, developed by balbooa.com, affecting all versions from 1.0.0 through 2.20.1. An unauthenticated remote attacker can invoke the extension’s resetPassword method without any authorization check, allowing them to reset the password of any Joomla user account—except super administrators—and immediately log in as that user. The vulnerability is rated CVSS 4.0: 10.0 (Critical) and carries an active exploitation maturity rating, indicating attacks are already occurring in the wild.

Technical details

  • Root cause: The resetPassword method in the Gridbox extension performs no authentication or authorization check before processing a password reset request, constituting a complete absence of access control (CWE-284) over a sensitive account operation.
  • Trigger conditions: The flaw is remotely exploitable with no prerequisites—no credentials, no prior session, no user interaction, and no special network position are required.
  • Attack vector: A network-accessible Joomla installation with Gridbox installed is sufficient. An attacker sends a crafted unauthenticated request targeting the resetPassword method to overwrite the password of any targeted user account.
  • Impact: Full account takeover for any non-super-admin Joomla user (registered users, editors, managers, administrators, etc.). Successful exploitation enables unauthorized login, content modification, data exfiltration, privilege escalation via lateral movement across other accounts, and—depending on the compromised account’s permissions—potentially full site compromise.
  • Automation: The CVSS vector includes AU:Y (Automatable: Yes), confirming attacks can be scripted and launched at scale across exposed Joomla installations.

Affected software

  • Gridbox extension for Joomla (by balbooa.com), versions 1.0.0 through 2.20.1 (all versions prior to 2.20.2)

Severity

This vulnerability was scored exclusively under CVSS 4.0; no CVSS v3.1 score has been published.

  • 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/E:A/AU:Y/U:Red

Mitigation and recommended actions

  • Immediate action — patch: Upgrade the Gridbox extension to version 2.20.2 or later, which contains the vendor-provided fix for this vulnerability. The patch is available through the balbooa.com Gridbox product page.
  • If immediate patching is not feasible: Restrict public network access to the Joomla installation at the firewall or WAF level until the extension can be updated. Consider temporarily disabling the Gridbox extension until the patch is applied.
  • Verify exposure: Audit all Joomla user accounts for unauthorized password changes or suspicious login activity indicative of prior exploitation.

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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