PatchTheCEVCVE-2026-65884: Joomla Extension - balbooa.com - Privilege Escalation in Gridbox < 2.20.2 - The registration method allows use
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CRITICAL 9.8REMOTEUPGRADE
CVE-2026-65884 is a critical-severity flaw (CVSS 9.8) affecting gridbox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Joomla Extension - balbooa.com - Privilege Escalation in Gridbox < 2.20.2 - The registration method allows users provided usergroup IDs, allowing unauthenticated actors to register new accounts with administrative permissions.
Why this priority
- Critical severity
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.5% (top 57%) |
| CISA exploited list | No |
| Weakness | CWE-284 |
| Published | 2026-07-29 |
| Last modified | 2026-10-23 |
Publisher (CNA): Joomla! Project · Vendor: balbooa
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
balbooa gridbox UPGRADE
Affected: < 2.20.2
Fixed in: 2.20.2
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy gridbox || rpm -q gridbox || gridbox --version
2. UPGRADE to 2.20.2 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade gridbox
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade gridbox
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Exact fixes by distribution
Fedora 46 · python-openslide · FIXED · 1.4.7-1.fc46 · FEDORA-2026-336bea884e · source
sudo dnf upgrade --advisory=FEDORA-2026-336bea884e
Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source
sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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