CVE-2026-88418

8.8 HIGHpublic exploit available

Published 2026-09-22 · Updated 2026-09-26

AI risk analysis

Summary: CMSimple 5.24 lacks CSRF protection, allowing unauthenticated attackers to inject and execute arbitrary PHP code via specially crafted content-save requests.
Exploitability: Exploitation is relatively straightforward as it requires an attacker to induce a logged-in administrator to visit a crafted page. Precondition is that the administrator must be authenticated via a cookie.
Blast radius: If exploited, this flaw allows persistent remote code execution for all visitors, including unauthenticated ones, potentially leading to full server compromise.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to CMSimple 5.24.1 or later.

rcecsrfwebphp

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weaknesses

CWE-352

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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