CVE-2026-102783 Joomla Extension - balbooa.com - Path Traversal in image preview Gridbox < 2.20.4.0
Attackers can read files from sibling directories via path traversal in the image preview feature of the Gridbox Joomla extension.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-102783?
CVE-2026-102783 is a medium-severity path traversal vulnerability in balbooa.com Gridbox extension for Joomla, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-102783?
How do I fix CVE-2026-102783?
No fix has been published for CVE-2026-102783 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-102783 being exploited?
There is no known exploitation of CVE-2026-102783 in the wild and no public exploit code.
Sources
Also known as GHSA-89x5-vmf9-w5cx.