---
id: CVE-2025-11876
title: >-
  The Mailgun Subscriptions plugin for WordPress is vulnerable to Stored
  Cross-Site Scripting via the plugin's 'mailgun_subscription_form' shortcode in
  all versions up to, and including, 1.3.1 due to insufficient input
  sanitization and out…
summary: >-
  The Mailgun Subscriptions plugin for WordPress is vulnerable to Stored
  Cross-Site Scripting via the plugin's 'mailgun_subscription_form' shortcode in
  all versions up to, and including, 1.3.1 due to insufficient input
  sanitization and out…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2025-12-12'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T20:10:01.970'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-11876'
references:
  - url: >-
      https://github.com/flightless/mailgun-subscriptions/pull/8/commits/a8b597e3a09f3a1b76436d09de434fd9bfe29f64
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/mailgun-subscriptions/tags/1.2.0/Mailgun_Subscriptions/Subscription_Form.php#L101
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3413662%40mailgun-subscriptions&new=3413662%40mailgun-subscriptions&sfp_email=&sfph_mail=
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/149e60cc-9612-4651-b02d-4b68a3533d36?source=cve
    label: security@wordfence.com
tags:
  - nvd
epss: 0.00223
epssPercentile: 0.11803
ingestedAt: '2026-10-07T20:46:46.895Z'
---

## Overview

The Mailgun Subscriptions plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'mailgun_subscription_form' shortcode in all versions up to, and including, 1.3.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

## Remediation

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