CVE-2026-67399

Published Sep 14, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Title WHMCS Unsafe Deserialization Enables Remote Code Execution
Type Values Removed Values Added
Title WHMCS Unsafe Deserialization Enables Remote Code Execution
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Webpros
Webpros whmcs
Vendors & Products Webpros
Webpros whmcs
Type Values Removed Values Added
Description 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.
Weaknesses CWE-502
References
Metrics cvssV4_0

{'score': 9.3, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
hackerone
Published
Updated
Sep 15, 2026, 1:28 PM
Reserved
Jul 29, 2026, 3:00 PM
Status
Deferred
Published
Sep 14, 2026, 9:17 PM
Modified
Sep 18, 2026, 7:04 PM