{"id":"CVE-2026-88418","title":"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","summary":"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 authent…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-352"],"published":"2026-09-22","updated":"2026-09-26","sourceUpdated":"2026-09-26T00:16:37.843","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-88418","references":[{"url":"https://github.com/15536818056/CVE/issues/5","label":"cve@mitre.org"},{"url":"https://github.com/15536818056/CVE/issues/5","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-25T23:23:56.913674Z"},"epss":0.00254,"epssPercentile":0.16896,"ingestedAt":"2026-09-22T20:10:15.101Z","slug":"CVE-2026-88418","body":"## Overview\n\nCMSimple 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":60,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":211229,"id":"CVE-2026-88418","ts":1790382261964,"field":"exploit_available","old":"false","new":"true"},{"seq":211228,"id":"CVE-2026-88418","ts":1790382261964,"field":"cvss","old":null,"new":"8.8"},{"seq":211227,"id":"CVE-2026-88418","ts":1790382261964,"field":"severity","old":"none","new":"high"}]}