Vulnerability Details CVE-2026-28495
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 18.3%
CVSS Severity
CVSS v3 Score 9.6
References
Products affected by CVE-2026-28495
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cpe:2.3:a:getsimple-ce:getsimple_cms:3.3.16
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cpe:2.3:a:getsimple-ce:getsimple_cms:3.3.17
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cpe:2.3:a:getsimple-ce:getsimple_cms:3.3.18
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cpe:2.3:a:getsimple-ce:getsimple_cms:3.3.18.1
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cpe:2.3:a:getsimple-ce:getsimple_cms:3.3.19
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cpe:2.3:a:getsimple-ce:getsimple_cms:3.3.19.1
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cpe:2.3:a:getsimple-ce:getsimple_cms:3.3.20
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cpe:2.3:a:getsimple-ce:getsimple_cms:3.3.21
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cpe:2.3:a:getsimple-ce:getsimple_cms:3.3.22