Vulnerability · Published Apr 20, 2026 · Assigned by VulDB

CVE-2026-6601Lagom WHMCS Template Datatables resource consumption

Medium 4.3

In plain English

A medium-severity uncontrolled resource consumption in WHMCS Template from Lagom. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 79.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Lagom	WHMCS Template	2.4.02.4.12.4.2

Weakness: CWE-400, CWE-404 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R

References

VDB-358236 | Lagom WHMCS Template Datatables resource consumption vdb-entry
VDB-358236 | CTI Indicators (IOB, IOC, TTP) signature, permissions-required
Submit #791943 | Lagom WHMCS Template ≤ 2.4.2 Denial of Service third-party-advisory
https://github.com/devsamuelsantiago/lagom-whmcs-dos-poc exploit