What is CVE-2026-65884?

CVE-2026-65884 is a critical-severity vulnerability in Balbooa Gridbox, classified under Improper Access Control. CVSS score: 9.8/10. Published 2026-07-29.

How severe is CVE-2026-65884?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Balbooa Gridbox

CVE-2026-65884

Joomla Extension - balbooa.com - Privilege Escalation in Gridbox < 2.20.2 - The registration method allows users provided usergroup IDs, allowing unauthenticated actors to register new accounts with administrative permissions.

Published 2026-07-29 · last modified 2026-10-23.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (43.8th percentile), scored 2026-10-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Balbooa Gridbox
Balbooa.com Gridbox Extension For Joomla — versions 1.0.0-2.20.1

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

www.balbooa.com/gridbox (Product, product)
mysites.guru/blog/gridbox-23-critical-vulnerabilities/ (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-65884?: CVE-2026-65884 is a critical-severity vulnerability in Balbooa Gridbox, classified under Improper Access Control. CVSS score: 9.8/10. Published 2026-07-29.
How severe is CVE-2026-65884?: Critical severity. CVSS v3 base score is 9.8 out of 10.