CVE-2026-75006
Received Received - Intake

CSS Sanitization Flaw in Roundcube Webmail

Publication date: 2026-08-17

Last updated on: 2026-08-17

Assigner: MITRE

Description
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.

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Meta Information

Published
2026-08-17
Last Modified
2026-08-17
Generated
2026-08-17
AI Q&A
2026-08-17
EPSS Evaluated
N/A
NVD
CVE-2026-75006
EUVD
EUVD-2026-60171

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
roundcube roundcube to 1.6.18 (exc)
roundcube roundcube From 1.7.0 (inc) to 1.7.3 (exc)
roundcube roundcube_webmail to 1.6.18 (exc)
roundcube roundcube_webmail From 1.7.0 (inc) to 1.7.3 (exc)
roundcube roundcube_webmail 1.6.18
roundcube roundcube_webmail 1.7.3

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

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Executive Summary

This vulnerability in Roundcube Webmail before versions 1.6.18 and 1.7.3 involves insufficient CSS sanitization in HTML emails. Attackers can exploit this by including stylesheet links that point to local network hosts, potentially leading to Server-Side Request Forgery (SSRF) or Information Disclosure. The issue persists due to incomplete fixes for prior CVEs.

Impact Analysis

An attacker could send a malicious email containing crafted CSS links. If you open this email, it may allow the attacker to access internal network resources (SSRF) or leak sensitive information (Information Disclosure). This could compromise your system or data.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR (data protection) and HIPAA (health information privacy). Organizations may face compliance breaches, legal penalties, and reputational damage if exploited.

Mitigation Strategies

Upgrade Roundcube Webmail to version 1.6.18 or later if using the 1.6.x branch, or to version 1.7.3 or later if using the 1.7.x branch to address the insufficient CSS sanitization issue.

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