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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.

PUBLISHED Reserved 2026-03-15 | Published 2026-03-16 | Updated 2026-03-16 | Assigner VulDB




MEDIUM: 5.1CVSS: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
LOW: 3.5CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
LOW: 3.5CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
4.0AV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:ND/RC:UR

Problem types

Improperly Controlled Modification of Object Prototype Attributes

Code Injection

Product status

2.3.0
affected

2.3.1
affected

2.3.2
affected

2.3.3
affected

2.3.4
affected

2.3.5
affected

2.3.6
affected

2.3.7
affected

Timeline

2026-03-15:Advisory disclosed
2026-03-15:VulDB entry created
2026-03-15:VulDB entry last update

Credits

s4nnty (VulDB User) reporter

VulDB coordinator

References

vuldb.com/?id.351181 (VDB-351181 | Lagom WHMCS Template Datatables prototype pollution) vdb-entry

vuldb.com/?ctiid.351181 (VDB-351181 | CTI Indicators (IOB, IOC, TTP)) signature permissions-required

vuldb.com/?submit.771350 (Submit #771350 | Lagom Lagom WHMCS Template * Prototype Pollution) third-party-advisory

github.com/devsamuelsantiago/lagom-prototype-pollution-poc/ exploit

github.com/...poc/blob/main/lagom-prototype-pollution-poc.js exploit

cve.org (CVE-2026-4239)

nvd.nist.gov (CVE-2026-4239)

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