CVE-2026-65885 PUBLISHED

Joomla Extension - balbooa.com - Authenticated arbitrary file upload in Gridbox < 2.20.2

Assigner: Joomla
Reserved: 23.07.2026 Published: 29.07.2026 Updated: 30.07.2026

Joomla Extension - balbooa.com - Authenticated arbitrary file upload in Gridbox < 2.20.2 - File upload methods allows authenticated attackers to upload arbitrary files. Turns into an authenticated RCE if combined with CVE-2026-65884 as the required account can be created by the attacker.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/AU:Y/U:Red
CVSS Score: 9.4

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	High
User Interaction	None

CVSS 4.0

Product Status

Vendor	balbooa.com
Product	Gridbox extension for Joomla
Versions	Default: unaffected Version 1.0.0-2.20.1 is affected

Credits

Phil Taylor finder
Pascal Lohmann finder

References

Problem Types

CWE-434: Unrestricted Upload of File with Dangerous Type CWE

Impacts

CAPEC-242: Code Injection