{"id":"CVE-2026-23923","title":"An unauthenticated attacker can exploit the Frontend 'validate' action to blindly instantiate arbitrary PHP classes","summary":"An unauthenticated attacker can exploit the Frontend 'validate' action to blindly instantiate arbitrary PHP classes. The impact depends on environment setup but appears limited at this time.","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-470"],"vendor":"zabbix","product":"zabbix","affected":["zabbix >= 7.4.0, < 7.4.7"],"patched":["zabbix 7.4.7"],"published":"2026-03-24","updated":"2026-09-10","sourceUpdated":"2026-09-10T21:16:44.433","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-23923","references":[{"url":"https://support.zabbix.com/browse/ZBX-27641","label":"security@zabbix.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-03-25T19:24:53.942052Z"},"scores":{"nvd":5.3,"cna":6.9},"ingestedAt":"2026-09-12T18:49:50.576Z","epss":0.00268,"epssPercentile":0.19149,"slug":"CVE-2026-23923","body":"## Overview\n\nAn unauthenticated attacker can exploit the Frontend 'validate' action to blindly instantiate arbitrary PHP classes. The impact depends on environment setup but appears limited at this time.\n\n## Affected\n\n- `zabbix >= 7.4.0, < 7.4.7`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `zabbix 7.4.7`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}