{"id":"CVE-2026-67399","title":"Deserialization of untrusted data in WHMCS 9.0.0 before 9.0.8 and 8.0.0 before 8.13.7 allows remote attackers to execute arbitrary code.","summary":"Deserialization of untrusted data in WHMCS 9.0.0 before 9.0.8 and 8.0.0 before 8.13.7 allows remote attackers to execute arbitrary code.","severity":"critical","cvss":9.3,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","cwe":["CWE-502"],"vendor":"WebPros","product":"WHMCS","affected":["WHMCS >= 9.0.0 < 9.0.8","WHMCS >= 8.0.0 < 8.13.7"],"published":"2026-09-14","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:04:14.413","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67399","references":[{"url":"https://help.whmcs.com/m/125386/l/2118034-cve-2026-67399-whmcs-security-update-2026-09-03","label":"support@hackerone.com"}],"tags":["nvd","cve.org"],"epss":0.00752,"epssPercentile":0.53001,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-15T13:28:16.542784Z"},"cvssSource":"cna","ingestedAt":"2026-09-14T21:15:17.461Z","slug":"CVE-2026-67399","body":"## Overview\n\nDeserialization of untrusted data in WHMCS 9.0.0 before 9.0.8 and 8.0.0 before 8.13.7 allows remote attackers to execute arbitrary code.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":51.2,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}