---
id: CVE-2026-114725
title: >-
  Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail
  header injection vulnerability
summary: >-
  Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail
  header injection vulnerability. rcmail_sendmail stripped newline characters
  only from the Subject and Organization headers, leaving other header values
  taken fr…
severity: medium
cvss: 5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-99
vendor: Roundcube
product: Webmail
affected:
  - Webmail >= 1.6.0 < 1.6.20
  - Webmail >= 1.7.0 < 1.7.5
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T01:52:10.894Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114725'
references:
  - url: 'https://bugs.debian.org/1151279'
  - url: >-
      https://github.com/roundcube/roundcubemail/commit/acd32a86f631dd6dcda8ac3ec7bd9ba4d4c0c117
  - url: 'https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5'
  - url: 'https://github.com/roundcube/roundcubemail/releases/tag/1.7.5'
  - url: 'https://github.com/roundcube/roundcubemail/releases/tag/1.6.20'
  - url: >-
      https://github.com/roundcube/roundcubemail/commit/79adcfc0c48012bbbe930278471425027fd7331c
tags:
  - cve.org
ingestedAt: '2026-10-22T02:23:25.179Z'
---

## Overview

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability. rcmail_sendmail stripped newline characters only from the Subject and Organization headers, leaving other header values taken from request parameters unsanitized, so a remote authenticated attacker could inject arbitrary headers into an outgoing message via the References, In-Reply-To, Message-ID and From parameters. Upstream fixed this in the commit “Fix mail header injection via References/In-Reply-To/Message-ID/From parameters”, which normalizes whitespace in every string header value.

## Affected

- `Webmail >= 1.6.0 < 1.6.20`
- `Webmail >= 1.7.0 < 1.7.5`

## Remediation

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