---
id: CVE-2026-83625
title: >-
  The Contact Form by Supsystic plugin for WordPress is vulnerable to Stored
  Cross-Site Scripting via IP Address Header in all versions up to, and
  including, 1.10.2 due to insufficient input sanitization and output escaping
summary: >-
  The Contact Form by Supsystic plugin for WordPress is vulnerable to Stored
  Cross-Site Scripting via IP Address Header in all versions up to, and
  including, 1.10.2 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'
cwe:
  - CWE-79
published: '2026-09-05'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T13:12:58.310'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83625'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/classes/utils.php#L77
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/controller.php#L390
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/controller.php#L411
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/js/admin.forms.contacts.list.js#L204
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/models/forms.php#L103
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/classes/utils.php#L77
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/controller.php#L390
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/controller.php#L411
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/js/admin.forms.contacts.list.js#L204
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/models/forms.php#L103
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3679442%40contact-form-by-supsystic&new=3679442%40contact-form-by-supsystic
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/aa65bced-a449-4ba5-accf-40a824ee464d?source=cve
    label: security@wordfence.com
tags:
  - nvd
epss: 0.0058
epssPercentile: 0.45352
ingestedAt: '2026-09-06T07:51:55.487Z'
---

## Overview

The Contact Form by Supsystic plugin for WordPress is vulnerable to Stored Cross-Site Scripting via IP Address Header in all versions up to, and including, 1.10.2 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. An unauthenticated attacker can first call the 'updateNonce' action — which is accessible without authentication due to its absence from the plugin's permission list — to obtain a valid nonce, then submit a contact form with a malicious payload in a spoofed IP header such as X-Forwarded-For.

## Remediation

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