---
id: CVE-2026-75004
title: >-
  In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, improper rule name
  quoting could lead to managesieve_disabled_actions setting bypass via a
  crafted rule name in a Sieve script
summary: >-
  In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, improper rule name
  quoting could lead to managesieve_disabled_actions setting bypass via a
  crafted rule name in a Sieve script. This issue only affects Roundcube
  instances using …
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-77
vendor: roundcube
product: webmail
affected:
  - 'webmail >= 1.6.0, < 1.6.18'
  - 'webmail >= 1.7.0, < 1.7.3'
patched:
  - webmail 1.7.3
published: '2026-08-17'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T18:46:33.850'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75004'
references:
  - url: 'https://github.com/roundcube/roundcubemail/releases/tag/1.6.18'
    label: cve@mitre.org
  - url: 'https://github.com/roundcube/roundcubemail/releases/tag/1.7.3'
    label: cve@mitre.org
  - url: 'https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.00374
epssPercentile: 0.28515
ingestedAt: '2026-09-08T19:08:49.591Z'
---

## Overview

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, improper rule name quoting could lead to managesieve_disabled_actions setting bypass via a crafted rule name in a Sieve script. This issue only affects Roundcube instances using the managesieve plugin.

## Affected

- `webmail >= 1.6.0, < 1.6.18`
- `webmail >= 1.7.0, < 1.7.3`

## Remediation

Upgrade past the affected range:

- `webmail 1.7.3`