---
id: CVE-2026-78374
title: >-
  Joomla Extension - joomlart.com - Open mail relay via contact AJAX endpoint in
  T4 Page Builder extension < 2.3.0
summary: >-
  Joomla Extension - joomlart.com - Open mail relay via contact AJAX endpoint in
  T4 Page Builder extension < 2.3.0 - The front-end JSON editor endpoint exposes
  an action called contact that requires no authentication, no CSRF token, no
  cap…
severity: medium
cvss: 6.9
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-201
vendor: joomlart.com
product: T4 Page Builder extension for Joomla
affected:
  - t4_page_builder_extension_for_joomla 1.0.0-2.2.0
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-10T11:54:08.148351Z'
published: '2026-09-10'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T04:46:10.305Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-78374'
references:
  - url: 'https://www.joomlart.com/t4-builder/t4-joomla-page-builder'
tags:
  - cve.org
epss: 0.00538
epssPercentile: 0.42833
ingestedAt: '2026-09-11T16:45:47.925Z'
---

## Overview

Joomla Extension - joomlart.com - Open mail relay via contact AJAX endpoint in T4 Page Builder extension < 2.3.0 - The front-end JSON editor endpoint exposes an action called contact that requires no authentication, no CSRF token, no captcha (when no captcha plugin is enabled) and has no rate limiting. The attacker fully controls the recipient, subject and HTML body, and the mail is sent from the site's configured sender identity (mailfrom/fromname).

## Affected

- `t4_page_builder_extension_for_joomla 1.0.0-2.2.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.