High severity · published Mar 10, 2026
CVE-2026-28495
GetSimple CMS has CSRF to Remote Code Execution via Arbitrary PHP Write in gsconfig.php
8.8
CVSS
0.3%
EPSS
No
On KEV
Description
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 the web server.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GE
GetSimpleCMS-CE · GetSimpleCMS-CE
<= 3.3.22 · source: vendor
GC
Getsimple Cms · Getsimple-ce
through 3.3.22 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28495
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28495
Exploit
https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-92wv-q2jp-qg88
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