---
id: CVE-2026-14556
title: >-
  HappyForms < 1.26.15 - Unauthenticated HTML Injection in Admin Notification
  Email via client_referer
summary: >-
  The HappyForms WordPress plugin before 1.26.15 does not sanitise or escape a
  user-controlled referral value before embedding it in the form notification
  email, allowing unauthenticated attackers to inject arbitrary HTML into the
  emails s…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-116
product: HappyForms
affected:
  - HappyForms < 1.26.15
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-21T10:11:32.422567Z'
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T10:14:54.939Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-14556'
references:
  - url: 'https://wpscan.com/vulnerability/7673862c-b37c-4c7e-af3f-c32cbd2deb23/'
tags:
  - cve.org
ingestedAt: '2026-10-21T09:46:15.399Z'
---

## Overview

The HappyForms WordPress plugin before 1.26.15 does not sanitise or escape a user-controlled referral value before embedding it in the form notification email, allowing unauthenticated attackers to inject arbitrary HTML into the emails site administrators receive.

## Affected

- `HappyForms < 1.26.15`

## Remediation

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