RCE in Lagom Whmcs Template
CVE-2026-4239
A vulnerability was found in Lagom WHMCS Template up to 2.3.7. Impacted is an unknown function of the component Datatables. The manipulation results in improperly controlled modification of object prototype attributes. It is possible to launch the attack remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability class: RCE (Remote Code Execution)
EPSS: 0.002 (10.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
Affected products
- Lagom Whmcs Template — versions 2.3.0, 2.3.1, 2.3.2
Weakness classification (CWE)
References
- cna@vuldb.com (vdb-entry)
- cna@vuldb.com (signature, permissions-required)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (exploit)
- cna@vuldb.com (exploit)
Frequently asked questions
- What is CVE-2026-4239?
- CVE-2026-4239 is a low-severity vulnerability in Lagom Whmcs Template, classified under Code Injection. CVSS score: 3.5/10. Published 2026-03-16.
- How severe is CVE-2026-4239?
- Low severity. CVSS v3 base score is 3.5 out of 10.