# CVE-2026-67399

## Summary

- **CVE ID:** CVE-2026-67399
- **Severity:** CRITICAL
- **CVSS Score:** 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)
- **CWE:** CWE-502
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

- WebPros — WHMCS (9.0.0)
- WebPros — WHMCS (8.0.0)

## References

- [CNA](https://help.whmcs.com/m/125386/l/2118034-cve-2026-67399-whmcs-security-update-2026-09-03)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.69%
- **EPSS Percentile:** 50.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._