CMSimple 5.24 ships with CSRF protection disabled by default, which turns csrfProtection() into a no-op on every state-changing admin request, and it does not send the csrf_token hidden field in admin forms. Because administrator authentication is cookie-only and no CSRF token is enforced, an unauthenticated attacker can induce a logged-in administrator's browser to issue a forged content-save request with a text payload containing a scripting marker. The marker is stored verbatim into content/content.php; on every subsequent page view evaluate_cmsimple_scripting() (functions.php) executes the marker body with PHP eval() — for all visitors, including unauthenticated ones. This yields persistent remote code execution on the web server.
History

Sat, 26 Sep 2026 07:00:00 +0000

Type Values Removed Values Added
Title CSRF Ignored Enables Persistent Remote Code Execution in CMSimple 5.24

Sat, 26 Sep 2026 05:45:00 +0000

Type Values Removed Values Added
Title CMSimple 5.24 Persistent Remote Code Execution from Disabled CSRF Protection
Weaknesses CWE-94

Sat, 26 Sep 2026 00:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 22 Sep 2026 21:15:00 +0000

Type Values Removed Values Added
Title CMSimple 5.24 Persistent Remote Code Execution from Disabled CSRF Protection
Weaknesses CWE-352
CWE-94

Tue, 22 Sep 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Cmsimple
Cmsimple cmsimple
Vendors & Products Cmsimple
Cmsimple cmsimple

Tue, 22 Sep 2026 19:45:00 +0000

Type Values Removed Values Added
Description CMSimple 5.24 ships with CSRF protection disabled by default, which turns csrfProtection() into a no-op on every state-changing admin request, and it does not send the csrf_token hidden field in admin forms. Because administrator authentication is cookie-only and no CSRF token is enforced, an unauthenticated attacker can induce a logged-in administrator's browser to issue a forged content-save request with a text payload containing a scripting marker. The marker is stored verbatim into content/content.php; on every subsequent page view evaluate_cmsimple_scripting() (functions.php) executes the marker body with PHP eval() — for all visitors, including unauthenticated ones. This yields persistent remote code execution on the web server.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-09-22T00:00:00.000Z

Updated: 2026-09-25T23:25:58.203Z

Reserved: 2026-09-10T00:00:00.000Z

Link: CVE-2026-88418

cve-icon Vulnrichment

Updated: 2026-09-25T23:25:49.748Z

cve-icon NVD

Status : Deferred

Published: 2026-09-22T20:17:10.960

Modified: 2026-09-26T00:16:37.843

Link: CVE-2026-88418

cve-icon Redhat

No data.