---
id: CVE-2026-75006
title: >-
  In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, insufficient
  Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to
  SSRF or Information Disclosure, e.g., if stylesheet links point to local
  network hosts.…
summary: >-
  In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, insufficient
  Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to
  SSRF or Information Disclosure, e.g., if stylesheet links point to local
  network hosts.…
severity: medium
cvss: 5.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N'
cwe:
  - CWE-918
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: '2026-09-08T18:43:44.230'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75006'
references:
  - url: >-
      https://github.com/roundcube/roundcubemail/commit/7e10ca0110b7c9aa1b7850b843bb6625e47bbe00
    label: cve@mitre.org
  - url: >-
      https://github.com/roundcube/roundcubemail/commit/8a92380b06b5df1481e034c4f40d6a6546c21223
    label: cve@mitre.org
  - url: >-
      https://github.com/roundcube/roundcubemail/commit/92f85c883594e5be757154f94548a9ba903455c9
    label: cve@mitre.org
  - url: >-
      https://github.com/roundcube/roundcubemail/commit/c111b72950cd2bf57d6b86cd129568d90403322d
    label: cve@mitre.org
  - 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: 0.00416
epssPercentile: 0.35612
ingestedAt: '2026-09-08T19:08:49.591Z'
---

## Overview

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts. This issue exists because of insufficient fixes for CVE-2026-35540, CVE-2026-48843 and CVE-2026-62643.

## 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`