---
id: CVE-2026-115303
title: >-
  Contact Form by Supsystic < 1.11.1 - Unauthenticated CRLF / Email Header
  Injection via Reply-To Field Mapping
summary: >-
  The Contact Form by Supsystic WordPress plugin before 1.11.1 does not strip
  CR/LF characters or re-validate submitted field values before concatenating
  them into outgoing email headers when a form is configured to map a submitted
  field i…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-93
product: Contact Form by Supsystic
affected:
  - contact_form_by_supsystic < 1.11.1
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-29T10:43:06.128153Z'
published: '2026-10-29'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T10:45:50.346Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115303'
references:
  - url: 'https://wpscan.com/vulnerability/c32e3ccd-84cb-42a4-a343-353a02ccb541/'
tags:
  - cve.org
epss: 0.00224
epssPercentile: 0.13044
ingestedAt: '2026-11-01T17:57:46.214Z'
---

## Overview

The Contact Form by Supsystic WordPress plugin before 1.11.1 does not strip CR/LF characters or re-validate submitted field values before concatenating them into outgoing email headers when a form is configured to map a submitted field into its Reply-To, From or Cc header, allowing unauthenticated users to inject arbitrary email headers such as additional Bcc or Cc recipients into the notification email.

## Affected

- `contact_form_by_supsystic < 1.11.1`

## Remediation

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