Answer in brief
CVE-2026-66490 records a Medium severity (CVSS 6.1) vulnerability in Joomla Extension - balbooa.com - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2. The current sources do not mark it as known exploited. The current feed maps balbooa.com/Gridbox extension for Joomla (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps balbooa.com/Gridbox extension for Joomla (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:balbooa:gridbox:*:*:*:*:*:joomla\!:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| balbooa.com/Gridbox extension for Joomlageneric | 1.0.0-2.20.1 | Not reported |
Published upstream
Jul 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
Joomla Extension - balbooa.com - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-66490 records a Medium severity (CVSS 6.1) vulnerability in Joomla Extension - balbooa.com - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2. The current sources do not mark it as known exploited. The current feed maps balbooa.com/Gridbox extension for Joomla (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps balbooa.com/Gridbox extension for Joomla (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:balbooa:gridbox:*:*:*:*:*:joomla\!:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| balbooa.com/Gridbox extension for Joomlageneric | 1.0.0-2.20.1 | Not reported |
Published upstream
Jul 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
Joomla Extension - balbooa.com - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2
Quoted source text, attributed separately from HOL analysis.