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Whmcs CVE-2026-67399

| EUVDEUVD-2026-78136 CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-09-14 hackerone GHSA-5jq9-2qvc-rc4h
9.3
CVSS 4.0 · Vendor: hackerone
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Severity by source

Vendor (hackerone) PRIMARY
9.3 CRITICAL
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (hackerone) · only source for this CVE.

CVSS VectorVendor: hackerone

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Analysis Generated
Sep 15, 2026 - 10:39 vuln.today
Patch available
Sep 14, 2026 - 22:19 EUVD
CVE Published
Sep 14, 2026 - 20:53 cve.org
CRITICAL 9.3

DescriptionCVE.org

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.

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CVE-2026-67399 vulnerability details – vuln.today

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