CVE-2026-4239

Lagom WHMCS Template Datatables prototype pollution

State: Published
Severity: 5.1 Medium
Published: Mar 16, 2026
Updated: Mar 16, 2026
Reserved: Mar 15, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P	VulDB
3.1	3.5 Low	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R	VulDB
3.0	3.5 Low	CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R	VulDB
2.0	4.0 Medium	AV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:ND/RC:UR	VulDB

Weaknesses

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
CWE-94 Code Injection

Affected Products

Product	Versions
WHMCS TemplateLagom	2.3.0Affected 2.3.1Affected 2.3.2Affected 2.3.3Affected 2.3.4Affected 2.3.5Affected 2.3.6Affected 2.3.7Affected

References

VDB-351181 | Lagom WHMCS Template Datatables prototype pollutionvdb-entry
VDB-351181 | CTI Indicators (IOB, IOC, TTP)signaturepermissions-required
Submit #771350 | Lagom Lagom WHMCS Template * Prototype Pollutionthird-party-advisory
https://github.com/devsamuelsantiago/lagom-prototype-pollution-poc/exploit
https://github.com/devsamuelsantiago/lagom-prototype-pollution-poc/blob/main/lagom-prototype-pollution-poc.jsexploit

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