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CVE-2026-4239

Lagom WHMCS Template Datatables prototype pollution

CVSS 5.1 MEDIUMEPSS 0.2%CWE-1321CWE-94
Vexday Risk Score
13Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 5.1EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
16 Mar 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
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
Affected products
Lagom · WHMCS Template

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References
https://github.com/devsamuelsantiago/lagom-prototype-pollution-poc/https://github.com/devsamuelsantiago/lagom-prototype-pollution-poc/blob/main/lagom-prototype-pollution-poc.jshttps://vuldb.com/?ctiid.351181https://vuldb.com/?id.351181https://vuldb.com/?submit.771350