# CVE-2026-66489: Balbooa Gridbox unauthenticated file system disclosure

Source: https://junglewise.ai/threats/cve-2026-66489-balbooa-gridbox-unauthenticated-file-system-disclosure  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-29. Updated: 2026-07-29  
License: CC BY 4.0 with a link back

CVE-2026-66489 · Severity: info · CVSS 5.3 · Published 2026-07-29

Gridbox is a popular drag-and-drop page builder used to design and manage Joomla websites. A security flaw in versions prior to 2.20.2 allows unauthorized individuals to view sensitive files on the website's server without needing a password. This could lead to the exposure of configuration details or other private data, potentially aiding further attacks against the site.

Technologies: [Balbooa Gridbox](https://junglewise.ai/threats/technologies/gridbox). Vendors: [Balbooa](https://junglewise.ai/threats/vendors/balbooa).

## Quick answers

**Is CVE-2026-66489 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-66489 being exploited in the wild.

**How severe is CVE-2026-66489?** Informational severity, with a CVSS score of 5.3, published 29 July 2026.

**Which products and versions are affected?** Balbooa Gridbox 1.0.0-2.20.1.

**Is there a fix for CVE-2026-66489?** A patch was published on 2026-07-20: Initial partial fix in version 2.20.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-66489 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-66489?** Check whether you run Balbooa Gridbox at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The Gridbox extension for Joomla (com_gridbox) contains multiple unauthenticated file system disclosure vulnerabilities in versions prior to 2.20.2. The flaw stems from insufficient input validation on certain endpoints, allowing a remote, unauthenticated attacker to bypass directory restrictions and read files from the server's file system. This was part of a larger set of 23 vulnerabilities discovered during a security audit of the component. Attackers can exploit this by sending specially crafted HTTP requests to the vulnerable component. Users should update to Gridbox version 2.20.2 or later to remediate these issues.

## Affected products

- balbooa.com Gridbox extension for Joomla 1.0.0-2.20.1

## Timeline

- 2026-07-20: patched: Initial partial fix in version 2.20.1
- 2026-07-29: advisory: Full disclosure of 23 vulnerabilities including this one
- 2026-07-29: disclosed: CVE-2026-66489 published

## References

- [https://mysites.guru/blog/gridbox-23-critical-vulnerabilities/](https://mysites.guru/blog/gridbox-23-critical-vulnerabilities/)
- [https://www.balbooa.com/gridbox](https://www.balbooa.com/gridbox)

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