---
id: CVE-2026-91831
title: >-
  Subscribe to Comments 2.3 - 2.3.2 - Author+ Email Header Injection via From
  Name Setting
summary: >-
  The Subscribe to Comments WordPress plugin before 2.3.3 does not sanitise
  newline characters from a notification sender-name setting before using it in
  e-mail headers, allowing users with Author-level access and above to inject
  arbitrary…
severity: low
cvss: 3.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-93
product: Subscribe to Comments
affected:
  - subscribe_to_comments >= 2.3 < 2.3.3
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-19T09:25:57.636205Z'
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T09:31:21.214Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-91831'
references:
  - url: 'https://wpscan.com/vulnerability/6cd60f78-f5e2-4b4a-8d50-7d2bc4f981ee/'
tags:
  - cve.org
ingestedAt: '2026-10-19T07:09:59.589Z'
---

## Overview

The Subscribe to Comments WordPress plugin before 2.3.3 does not sanitise newline characters from a notification sender-name setting before using it in e-mail headers, allowing users with Author-level access and above to inject arbitrary e-mail headers, such as a hidden Bcc, and to spoof the sender.

## Affected

- `subscribe_to_comments >= 2.3 < 2.3.3`

## Remediation

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