PHP
CVE-2026-28495
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
AnalysisAI
GetSimple CMS massiveAdmin plugin has a CSRF vulnerability enabling attackers to perform admin actions through crafted malicious pages.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | GetSimple CMS v3.3.22 with massiveAdmin plugin v6.0.3 bundled and enabled; target admin must be authenticated and visit attacker-controlled page; gsconfig editor module must lack CSRF token validation Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 9.6 with PoC. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker creates a malicious webpage that, when visited by a GetSimple CMS admin, performs administrative actions like creating new admin accounts or modifying site content. |
| Remediation | Update the plugin. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit all administrator accounts for unauthorized access and review recent configuration file modifications in audit logs. …
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External POC / Exploit Code
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