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CVE-2026-102789CriticalCVSS 9.3CVE published 27 October 2026Added to mySites.guru 27 October 2026

Gridbox (com_gridbox) 2.20.4.0 to 2.20.4.1 - Unauthenticated SQL Injection (blog post sorting and editor task, fixed in 2.20.4.2)

Balbooa released Gridbox 2.20.4.2 on 27 October 2026 to fix two SQL injection flaws, rated Critical by the vendor. The sort order of blog and store post lists was taken from the request and placed into the database query without checking it against the list of allowed sort options, and one of the page editor's post-loading tasks could be called by any visitor without a login and passed its sort order into the same query. Neither needs an account, so an anonymous visitor can read data from the site database. We confirmed both changes by comparing the public 2.20.4.2 package with 2.20.4.1. Balbooa lists Gridbox 2.20.4.1 and earlier as affected; this rule covers 2.20.4.0 and 2.20.4.1, and older versions are flagged by separate Gridbox rules that should also go straight to 2.20.4.2. Reported by Artur Błażewicz, coordinated by the Joomla Security Strike Team. Not a mySites.guru finding. The Joomla CNA published CVE-2026-102788 (SQL injection through the store list sort order, CWE-89) and CVE-2026-102789 (missing authorisation on the editor task, CWE-284) on 27 October 2026, both CVSS 4.0 9.3 Critical, affecting 1.0.0 to 2.20.4.1. Update to Gridbox 2.20.4.2.

Is my site affected?

Affected
Gridbox from 2.20.4.0 up to but not including 2.20.4.2
Fixed in
2.20.4.2
What to do
Update Gridbox to 2.20.4.2 or later.
Check whether your sites are affected

How CVE-2026-102789 is scored

The base metrics as Joomla CNA published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw.

9.3 Critical

CVSS 4.0, scored by Joomla CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

How it is reached

AV:N Attack vector
Network. Reachable across the internet
AC:L Attack complexity
Low. Nothing to work around, it just works
AT:N Attack requirements
None. Works against any affected install
PR:N Privileges required
None. No account needed
UI:N User interaction
None. Nobody has to be tricked into anything

What it does to the site

VC:H Confidentiality
High. Everything the site holds can be read
VI:H Integrity
High. Data and files can be altered at will
VA:H Availability
High. The site can be taken down

What it does beyond the site

SC:N Confidentiality
None. Other systems keep their data
SI:N Integrity
None. Other systems keep their integrity
SA:N Availability
None. Other systems stay up

Timeline

  1. 27 October 2026CVE-2026-102789 record published by its CNA
  2. 27 October 2026mySites.guru check added for Gridbox (from 2.20.4.0 up to but not including 2.20.4.2)
  3. 27 October 2026We published: Gridbox 2.20.4.2 Fixes Two Unauthenticated SQL Injection Flaws

Rule details

Our disclosure post

Gridbox 2.20.4.2 Fixes Two Unauthenticated SQL Injection Flaws

Gridbox 2.20.4.2 Fixes Two Unauthenticated SQL Injection Flaws

Gridbox 2.20.4.2 fixes two SQL injection flaws that need no login. About 95% of the Gridbox sites we monitor were affected. Update every Joomla site today.

Other vulnerabilities in Gridbox

Updating for CVE-2026-102789 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension.

Gridbox

Latest safe version: 2.20.4.2

All 16 CVEs in Gridbox

References

CVE-2026-102789 questions

Which versions are affected by CVE-2026-102789?
CVE-2026-102789 affects Gridbox from 2.20.4.0 up to but not including 2.20.4.2. The fix is in 2.20.4.2.
How do I fix CVE-2026-102789?
Update Gridbox to 2.20.4.2 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-102789?
Joomla CNA scores it 9.3 (Critical) under CVSS 4.0. In plain terms: reachable across the internet, no account needed and nobody has to be tricked into anything.

Running an affected version on a site you manage?

A free audit tells you which of your Joomla and WordPress sites run an affected version, which are out of date, and which have not been backed up. No card required. If a site is already compromised, fix.mysites.guru is a single fixed fee per incident, usually resolved the same day.

This check is part of the mySites.guru Joomla vulnerability scanner, which reads every installed extension's version on each audit. Browse the rest of the Joomla vulnerability database.

Rules current as of 27 October 2026.