Low severity3.5NVD Advisory· Published Mar 16, 2026· Updated Apr 29, 2026

CVE-2026-4239

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.

Affected products

Devsamuelsantiago/Lagom Prototype Pollution Pocreferences

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

News mentions

No linked articles in our index yet.

Severity

LowCVSS v3.1

3.5/ 10

CVSS v42.0

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack vector: Network
Complexity: Low
Privileges: Low
User interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

EPSS

Probability of exploitation in the next 30 days.

0.04%

VYPR risk score

Composite of severity, exploitation, and reach.

0.23low

cvss	0.227
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000

Weaknesses

CWE-1321
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CWE-94
Improper Control of Generation of Code ('Code Injection')

CVE ID

CVE-2026-4239

Source code

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

Credits

S(
s4nnty (VulDB User)
reporter
V
VulDB
coordinator