Balbooa Gridbox Extension up to 2.20.3.1 Site UploaderHelper showImage path traversal

Summaryinfo

A vulnerability marked as problematic has been reported in Balbooa Gridbox Extension up to 2.20.3.1. Affected by this vulnerability is the function showImage of the file UploaderHelper of the component Site UploaderHelper. The manipulation leads to path traversal. This vulnerability is traded as CVE-2026-102783. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Balbooa Gridbox Extension up to 2.20.3.1. It has been rated as problematic. This issue affects the function showImage of the file UploaderHelper of the component Site UploaderHelper. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. The summary by CVE is:

Joomla Extension - balbooa.com - Path Traversal in image preview Gridbox < 2.20.4.0 - Gridbox contains the same prefix-only containment logic in its site UploaderHelper . The showImage action resolves a request-controlled path, calls that helper, and then returns the image. If image decoding is unavailable or fails, the action streams the file directly. An existing image in a sibling directory such as images-backup can therefore satisfy the current containment test even though it is outside the configured images root. The route restricts the file extension to Gridbox image types, which materially limits the read primitive. The default media root is images ; the effective site setting was not independently verified. No prefix-matching sibling directory was found alongside the site’s images directory. The finding is rated Low rather than presented as arbitrary file disclosure.

The advisory is shared at balbooa.com. The identification of this vulnerability is CVE-2026-102783 since 09/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/08/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Balbooa

Name

• Gridbox Extension

Version

• 2.20.3.0
• 2.20.3.1

CPE 2.3info

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CPE 2.2info

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