CVE-2026-28495: GetSimple CMS is a content management system

Q: How do I fix CVE-2026-28495?

getsimple cms: upgrade to newer than 3.3.22. Exact commands for each OS are on this page.

Q: Is CVE-2026-28495 being exploited?

CVE-2026-28495 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-28495 affect?

CVE-2026-28495 affects getsimple cms. Severity is critical (CVSS 9.6). GetSimple CMS is a content management system. The massiveAdmin plugin (v6.0.3) bundled with GetSimpleCMS-CE v3.3.22 allows an authenticated administrator to overwrite the gsconfig.php configuration file with arbitrary PHP code via the gscon

Q: How urgent is CVE-2026-28495?

Priority 45/100. Critical severity; Public exploit reference

This month

CRITICAL 9.6UPGRADE

CVE-2026-28495 is a critical-severity flaw (CVSS 9.6) affecting getsimple cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

GetSimple CMS is a content management system. The massiveAdmin plugin (v6.0.3) bundled with GetSimpleCMS-CE v3.3.22 allows an authenticated administrator to overwrite the gsconfig.php configuration file with arbitrary PHP code via the gsconfig editor module. The form lacks CSRF protection, enabling a remote unauthenticated attacker to exploit this via Cross-Site Request Forgery against a logged-in admin, achieving Remote Code Execution (RCE) on t

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-352
Published	2026-03-10
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: getsimple-ce

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-10 20:16 UTCPublished CVE record published
2026-06-17 10:28 UTCUpdated Record last modified

getsimple-ce getsimple cms UPGRADE

Affected: <= 3.3.22

Fixed in: newer than 3.3.22

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy getsimple-cms || rpm -q getsimple-cms || getsimple-cms --version

2. UPGRADE to newer than 3.3.22 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade getsimple-cms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade getsimple-cms

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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.

Quick answers

How do I fix CVE-2026-28495?

getsimple cms: upgrade to newer than 3.3.22. Exact commands for each OS are on this page.

Is CVE-2026-28495 being exploited?

CVE-2026-28495 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-28495 affect?

CVE-2026-28495 affects getsimple cms. Severity is critical (CVSS 9.6). GetSimple CMS is a content management system. The massiveAdmin plugin (v6.0.3) bundled with GetSimpleCMS-CE v3.3.22 allows an authenticated administrator to overwrite the gsconfig.php configuration file with arbitrary PHP code via the gscon

How urgent is CVE-2026-28495?

Priority 45/100. Critical severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-26351 MEDIUM 4.8 UPGRADE GetSimpleCMS Community Edition (CE) versions prior to 3.3.22 (3.3.16 tested) contains a stored cross-site scri
CVE-2026-27202 HIGH 7.5 DOWNGRADE GetSimple CMS is a content management system
CVE-2026-27161 HIGH 7.5 UPGRADE GetSimple CMS is a content management system
CVE-2026-27147 MEDIUM 5.4 UPGRADE GetSimple CMS is a content management system
CVE-2026-27146 MEDIUM 4.5 UPGRADE GetSimple CMS is a content management system

References

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