CVE-2026-65888: Joomla Extension - balbooa.com - Account takeover vulnerability in Gridbox < 2.20.2 - The socialLogin method a

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CRITICAL 9.8REMOTEUPGRADE

CVE-2026-65888 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 - Account takeover vulnerability in Gridbox < 2.20.2 - The socialLogin method allows actors to login as any given user on the target site.

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

2026-07-29 15:16 UTCPublished CVE record published
2026-10-23 23:10 UTCUpdated 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.

Write-up: mysites.guru/blog/gridbox-23-critical-vulnerabilities/

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.

Related CVEs

CVE-2026-65884 CRITICAL 9.8 UPGRADE Joomla Extension - balbooa.com - Privilege Escalation in Gridbox < 2.20.2 - The registration method allows use
CVE-2026-65887 CRITICAL 9.8 UPGRADE Joomla Extension - balbooa.com - Unauthenticated arbitrary password reset in Gridbox < 2.20.2 - The resetPassw
CVE-2026-65890 CRITICAL 9.8 UPGRADE Joomla Extension - balbooa.com - Unauthenticated SQL injection in Gridbox < 2.20.2 - Multiple SQLi vectors all
CVE-2026-65886 HIGH 7.5 UPGRADE Joomla Extension - balbooa.com - Unauthenticated arbitrary file read in Gridbox < 2.20.2 - The photo viewer al
CVE-2026-65885 HIGH 8.8 UPGRADE Joomla Extension - balbooa.com - Authenticated arbitrary file upload in Gridbox < 2.20.2 - File upload methods

References

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