Resource exhaustion in Lagom Whmcs Template
CVE-2026-6601
A vulnerability has been found in Lagom WHMCS Template up to 2.4.2. This impacts an unknown function of the component Datatables. The manipulation leads to resource consumption. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (38.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Lagom Whmcs Template — versions 2.4.0, 2.4.1, 2.4.2
Weakness classification (CWE)
References
- vuldb.com/vuln/358236 (vdb-entry)
- vuldb.com/vuln/358236/cti (signature, permissions-required)
- vuldb.com/submit/791943 (third-party-advisory)
- github.com/devsamuelsantiago/lagom-whmcs-dos-poc (exploit)
Frequently asked questions
- What is CVE-2026-6601?
- CVE-2026-6601 is a medium-severity vulnerability in Lagom Whmcs Template, classified under Uncontrolled Resource Consumption. CVSS score: 4.3/10. Published 2026-04-20.
- How severe is CVE-2026-6601?
- Medium severity. CVSS v3 base score is 4.3 out of 10.