---
id: CVE-2026-103999
title: >-
  Ultra Addons for Contact Form 7 <= 3.5.54 - Unauthenticated Stored Cross-Site
  Scripting via File Upload
summary: >-
  The Ultra Addons for Contact Form 7 plugin for WordPress is vulnerable to
  Stored Cross-Site Scripting via File Upload in all versions up to, and
  including, 3.5.54 due to insufficient input sanitization and output escaping.
  This makes it …
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: themefic
product: Ultra Addons for Contact Form 7
affected:
  - ultra_addons_for_contact_form_7 <= 3.5.54
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T05:30:20.027Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-103999'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/29b9d978-f8b0-48f9-a10e-7e61a4f4a828?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/ultimate-addons-for-contact-form-7/tags/3.5.52/addons/database/database.php#L901
  - url: >-
      https://plugins.trac.wordpress.org/browser/ultimate-addons-for-contact-form-7/tags/3.5.52/addons/database/database.php#L895
  - url: >-
      https://plugins.trac.wordpress.org/browser/ultimate-addons-for-contact-form-7/tags/3.5.52/addons/database/database.php#L869
  - url: >-
      https://plugins.trac.wordpress.org/browser/ultimate-addons-for-contact-form-7/tags/3.5.52/inc/functions.php#L1703
  - url: >-
      https://downloads.wordpress.org/plugin/ultimate-addons-for-contact-form-7.zip
  - url: >-
      https://plugins.trac.wordpress.org/changeset/3738548/ultimate-addons-for-contact-form-7/trunk/addons/database/database.php
tags:
  - cve.org
ingestedAt: '2026-10-16T06:00:00.396Z'
---

## Overview

The Ultra Addons for Contact Form 7 plugin for WordPress is vulnerable to Stored Cross-Site Scripting via File Upload in all versions up to, and including, 3.5.54 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The extension blocklist gatekeeper is bypassed by uploading text-type files (.txt, .csv, .vtt, .srt, .asc) whose contents begin with an HTML payload such as '<BODY onload=…>', as the check classifies these files as text/plain without inspecting their byte content.

## Affected

- `ultra_addons_for_contact_form_7 <= 3.5.54`

## Remediation

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