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CVE-2026-107129HighAdded to mySites.guru 4 November 2026

Gridbox (com_gridbox) 2.20.4.2 - Unauthenticated File Deletion and Stored XSS in Comments and Reviews (fixed in 2.20.5.0)

Balbooa released Gridbox 2.20.5.0 on 4 November 2026 with four security fixes, rated High by the vendor: stored cross-site scripting in the Recent Comments and Recent Reviews widgets, stored cross-site scripting in individual reviews and replies, deletion of temporary comment and review attachments without path, ownership or CSRF checks, and deletion of form submission files without any authorisation check (an IDOR that the vendor says needed no login). The release also hardens CSRF and permission checks across actions that change data, file path checks, CSV exports (SQL injection and spreadsheet formula injection) and server-side validation in the store and booking apps. We confirmed the attachment deletion, CSRF and sanitisation changes by comparing the public 2.20.5.0 package with 2.20.4.2. Found by Balbooa in its own security review; CVE ids assigned through the Joomla Security Strike Team. Not a mySites.guru finding. The Joomla CNA has reserved CVE-2026-105607, CVE-2026-107129, CVE-2026-107130 and CVE-2026-107903; the records were not yet published when this rule was written, and Balbooa does not say which id is which fix. Balbooa lists Gridbox 2.20.4.2 and earlier as affected; this rule covers 2.20.4.2, and older versions are flagged by separate Gridbox rules that should also go straight to 2.20.5.0. Update to Gridbox 2.20.5.0.

Is my site affected?

Affected
Gridbox from 2.20.4.2 up to but not including 2.20.5.0
Fixed in
2.20.5.0
What to do
Update Gridbox to 2.20.5.0 or later.
Check whether your sites are affected

How severe CVE-2026-107129 is

The published CVE record has no CVSS score, so there is no vector to break down here. mySites.guru rates it High, and that is the rating your sites are checked against.

Timeline

  1. 4 November 2026mySites.guru check added for Gridbox (from 2.20.4.2 up to but not including 2.20.5.0)
  2. 4 November 2026We published: Gridbox 2.20.5.0 Fixes Unauthenticated File Deletion and Stored XSS

Rule details

Our disclosure post

Gridbox 2.20.5.0 Fixes Unauthenticated File Deletion and Stored XSS

Gridbox 2.20.5.0 Fixes Unauthenticated File Deletion and Stored XSS

Gridbox 2.20.5.0 fixes four flaws in the Joomla extension, including file deletion that needs no login. About 92% of the Gridbox sites we monitor are affected.

Other vulnerabilities in Gridbox

Updating for CVE-2026-107129 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: 2.20.5.0

All 20 CVEs in Gridbox

References

CVE-2026-107129 questions

Which versions are affected by CVE-2026-107129?
CVE-2026-107129 affects Gridbox from 2.20.4.2 up to but not including 2.20.5.0. The fix is in 2.20.5.0.
How do I fix CVE-2026-107129?
Update Gridbox to 2.20.5.0 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-107129?
The published CVE record has no CVSS score. mySites.guru rates it High.

Running an affected version on a site you manage?

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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 4 November 2026.