What is CVE-2026-66490?

CVE-2026-66490 is a medium-severity vulnerability in Balbooa.com Gridbox Extension For Joomla, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-07-29.

How severe is CVE-2026-66490?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Balbooa.com Gridbox Extension For Joomla

CVE-2026-66490

Joomla Extension - balbooa.com - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

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

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security@joomla.org (product)
security@joomla.org (third-party-advisory)

Frequently asked questions

What is CVE-2026-66490?: CVE-2026-66490 is a medium-severity vulnerability in Balbooa.com Gridbox Extension For Joomla, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-07-29.
How severe is CVE-2026-66490?: Medium severity. CVSS v3 base score is 6.1 out of 10.