XSS in Balbooa.com Gridbox Extension For Joomla

CVE-2026-107903

Joomla Extension - balbooa.com - Stored XSS in reviews via inconsistent sanitization in Gridbox < 2.20.5.0

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.003 (27.5th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-107903?
CVE-2026-107903 is a high-severity vulnerability in Balbooa.com Gridbox Extension For Joomla, classified under Cross-site Scripting. CVSS score: 8.3/10. Published 2026-11-05.
How severe is CVE-2026-107903?
High severity. CVSS v3 base score is 8.3 out of 10.