CVE-2026-102783
Received Received - Intake

Path Traversal in Gridbox Joomla Extension

Publication date: 2026-10-08

Last updated on: 2026-10-08

Assigner: Joomla! Project

Description
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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-08
Last Modified
2026-10-08
Generated
2026-10-08
AI Q&A
2026-10-08
EPSS Evaluated
N/A
NVD
CVE-2026-102783
EUVD
EUVD-2026-94934

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
balbooa.com Gridbox extension for Joomla 1.0.0-2.20.3.1

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
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.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is a Path Traversal issue in the Gridbox Joomla extension versions before 2.20.4.0. It allows an attacker to access files outside the intended directory by manipulating the path in the image preview feature. The flaw occurs because the showImage action uses a request-controlled path that fails to properly validate file locations, potentially exposing files in sibling directories like images-backup.

Detection Guidance

To detect this vulnerability, check if your Gridbox extension for Joomla is running a version older than 2.20.4.0. Review server logs for suspicious image preview requests or file access attempts outside the configured images directory. Look for requests to paths like /index.php?option=com_gridbox&task=uploaderhelper.showimage with unusual parameters.

Impact Analysis

An attacker could read sensitive files on your server, such as backups or configuration files, if they are located near the images directory. This could lead to information disclosure, including credentials or other sensitive data. The impact is limited by the file extension restrictions to Gridbox image types.

Compliance Impact

The vulnerability allows limited file read access within the Joomla site's directory structure, which could expose sensitive data if improperly configured. This may impact compliance with GDPR if personal data is accessed without authorization, or HIPAA if protected health information is involved. However, the restricted nature of the read primitive (limited to Gridbox image types) reduces but does not eliminate potential compliance risks.

Mitigation Strategies

Immediately update Gridbox to version 2.20.4.0 or later. If an update is not available, disable the image preview feature or restrict access to the uploaderhelper.showimage endpoint via server configuration. Review file permissions to ensure the images directory is properly secured.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-102783. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart