CVE-2026-4239 Details
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.
A prototype pollution vulnerability has been identified in the Lagom WHMCS Template, specifically in versions up to 2.3.7. This vulnerability arises from an outdated version of the DataTables library (prior to 1.10.23) that the template bundles. The issue allows remote attackers to manipulate the Object.prototype of JavaScript objects by exploiting an exposed internal function, leading to the injection of properties or methods that can disrupt the application's behavior. Such exploitation could cause cross-site scripting (XSS), validation bypass, denial of service, and other unexpected issues.
Users are advised to update the DataTables library to version 1.10.23 or later. If an immediate update is not possible, a temporary workaround involves patching the vulnerable function to block prototype pollution attempts.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Mar 16, 2026CISA-ADP
Assessed Mar 16, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/devsamuelsantiago/lagom-prototype-pollution-poc/ | [email protected] | Exploit |
| https://github.com/devsamuelsantiago/lagom-prototype-pollution-poc/blob/main/lagom-prototype-pollution-poc.js | [email protected] | Exploit |
| https://vuldb.com/?ctiid.351181 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/?id.351181 | [email protected] | AdvisoryExploitPartial Content |
| https://vuldb.com/?submit.771350 | [email protected] | ExploitRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1321 | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') | [email protected] |
| CWE-94 | Improper Control of Generation of Code ('Code Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Lagom WHMCS Template | All versions |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Mar 16, 2026 | New CVE Received | [email protected] |