---
id: CVE-2026-101127
title: >-
  Joomla Extension - balbooa.com - Unauthenticated upload filename stored XSS in
  Balbooa Forms < 2.4.3.4 - The public form upload endpoint validates the
  uploaded file's extension and detected MIME type, but stores the
  attacker-supplied ori…
summary: >-
  Joomla Extension - balbooa.com - Unauthenticated upload filename stored XSS in
  Balbooa Forms < 2.4.3.4 - The public form upload endpoint validates the
  uploaded file's extension and detected MIME type, but stores the
  attacker-supplied ori…
severity: high
cvss: 8.6
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N'
cwe:
  - CWE-79
vendor: balbooa.com
product: com_baforms
affected:
  - com_baforms 1.0.0-2.4.3.3
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T17:17:05.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101127'
references:
  - url: 'https://www.balbooa.com/'
    label: security@joomla.org
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-29T17:41:02.203Z'
---

## Overview

Joomla Extension - balbooa.com - Unauthenticated upload filename stored XSS in Balbooa Forms < 2.4.3.4 - The public form upload endpoint validates the uploaded file's extension and detected MIME type, but stores the attacker-supplied original multipart filename verbatim in `#__baforms_submissions_attachments.name`. A later anonymous form submission associates that temporary attachment with the newly created submission. When an administrator opens the submission, the component's JavaScript retrieves the stored attachment record and concatenates `file.name` directly into an HTML string. The complete string is assigned to `innerHTML`.

## Remediation

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