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CVE-2026-65884 – Unauthenticated Privilege Escalation to Administrator – Gridbox extension for Jooml

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Summary

CVE-2026-65884 is a critical improper access control (CWE-284) vulnerability in the Gridbox extension for Joomla (com_gridbox) by balbooa.com. The extension’s registration functionality allows an unauthenticated attacker to specify arbitrary usergroup IDs during account creation, enabling them to register accounts with administrative-level privileges. The flaw is rated CVSS 10.0 (Critical) and, per the CVE record, is being actively exploited.

Technical details

  • Root cause: The account registration flow in Gridbox fails to constrain user-supplied input, permitting the requester to set the usergroup ID assigned to the new account (CWE-284, Improper Access Control).
  • Trigger conditions: An attacker submits a crafted registration request that includes an elevated usergroup ID, without any prior authentication or privileged access.
  • Attack vector: Network — the registration endpoint is reachable remotely over HTTP(S); no authentication, no user interaction, and low attack complexity are required.
  • Impact: Successful exploitation grants the attacker an administrative-level Joomla account. On Joomla, administrative access can be leveraged to achieve full compromise of confidentiality, integrity, and availability of the site and underlying system.

Affected software

  • Gridbox extension for Joomla (com_gridbox), vendor balbooa.com
  • Versions 1.0.0 through 2.20.1 (inclusive)

Severity

  • CVSS v4.0 Base Score: 10.0 (Critical)
  • CVSS v4.0 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
  • Attack Vector: Network; Privileges Required: None; User Interaction: None

Mitigation and recommended actions

  • Immediate: Upgrade the Gridbox extension to version 2.20.2 or later, which addresses the vulnerability.
  • If no patch can be applied immediately: Restrict or disable public user registration handled through the Gridbox extension, and block access to the registration endpoint at the web server / WAF layer until the update is applied.
  • Post-exploitation review: Audit Joomla user accounts and usergroup assignments for unexpected administrative accounts, and remove any unauthorized accounts, as the flaw is reported as actively exploited.

References

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