---
id: CVE-2026-88853
title: >-
  Joomla Extension - regularlabs.com - Privileged stored XSS via event handler
  option in Modals Pro extension for Joomla < 17.0.0 - Modals Pro intentionally
  supports JavaScript Events such as on-open and on-closed
summary: >-
  Joomla Extension - regularlabs.com - Privileged stored XSS via event handler
  option in Modals Pro extension for Joomla < 17.0.0 - Modals Pro intentionally
  supports JavaScript Events such as on-open and on-closed. Affected versions do
  not…
severity: high
cvss: 7.5
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/S:N/AU:N'
cwe:
  - CWE-79
vendor: regularlabs.com
product: plg_system_modals
affected:
  - plg_system_modals 4.7.0-16.2.0
published: '2026-09-14'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:28:06.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88853'
references:
  - url: 'https://www.regularlabs.com/'
    label: security@joomla.org
tags:
  - nvd
  - cve.org
epss: 0.00418
epssPercentile: 0.33329
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-14T14:55:23.369039Z'
cvssSource: cna
ingestedAt: '2026-09-14T15:23:07.421Z'
---

## Overview

Joomla Extension - regularlabs.com - Privileged stored XSS via event handler option in Modals Pro extension for Joomla < 17.0.0 - Modals Pro intentionally supports JavaScript Events such as on-open and on-closed. Affected versions do not distinguish trusted extension configuration from event code supplied in ordinary article content. A lower-privileged author can therefore use a documented executable feature which should be reserved for trusted authors.

## Remediation

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