CVE-2026-67399CWE-502insecure-deserialization

CVE-2026-67399

published September 15, 2026

CVSS
9.3
EPSS
1%
Percentile
54.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
9.3 · NONE
CVSS v4.0
9.3 · 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
EPSS
0.00752 · 54.5th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-09-15T01:17Z
References (1)
https://help.whmcs.com/m/125386/l/2118034-cve-2026-67399-whmcs-security-update-2026-09-03 · [email protected]
EPSS history
Timeline
  • 17 SEP 03:32Z
    EPSS moved — → 1%
    epss
  • 14 SEP 20:53Z
    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
    cvelistv5