In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, 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. NOTE: this issue exists because of insufficient fixes for CVE-2026-35540 and CVE-2026-48843.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00246.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Roundcube Webmail unaffected
Version Status Constraints
1.6.0 affected < 1.6.17
1.7.0 affected < 1.7.2

No data.

No data.

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Vendors Products
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Project Subscriptions

Vendors Products
Roundcube Subscribe
Webmail Subscribe
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4693-1 roundcube security update
Debian DSA Debian DSA DSA-6391-1 roundcube security update
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/roundcube/roundcubemail/commit/294c7da6e7284166f040cef8607b677d459e0786 cve-icon
https://github.com/roundcube/roundcubemail/commit/6d69e094d55d3a9a84dfb36edf6ca985311f0c1c cve-icon
https://github.com/roundcube/roundcubemail/releases/tag/1.6.17 cve-icon
https://github.com/roundcube/roundcubemail/releases/tag/1.7.2 cve-icon
https://roundcube.net/news/2026/07/05/security-updates-1.6.17-and-1.7.2 cve-icon
History

Thu, 23 Jul 2026 02:45:00 +0000

Type Values Removed Values Added
Title Insufficient CSS Sanitization in Roundcube Webmail Enables SSRF and Information Disclosure

Mon, 20 Jul 2026 22:45:00 +0000

Type Values Removed Values Added
Title Insufficient CSS Sanitization in Roundcube Webmail Leads to SSRF and Information Disclosure

Thu, 16 Jul 2026 07:30:00 +0000

Type Values Removed Values Added
Title Insufficient CSS Sanitization in Roundcube Webmail Leads to SSRF and Information Disclosure

Tue, 14 Jul 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 14 Jul 2026 16:15:00 +0000

Type Values Removed Values Added
Description In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, 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. NOTE: this issue exists because of insufficient fixes for CVE-2026-35540 and CVE-2026-48843.
First Time appeared Roundcube
Roundcube webmail
Weaknesses CWE-918
CPEs cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
Vendors & Products Roundcube
Roundcube webmail
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-07-14T17:17:16.894Z

Reserved: 2026-07-14T15:51:46.593Z

Link: CVE-2026-62643

cve-icon Vulnrichment

Updated: 2026-07-14T17:16:57.343Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-23T02:30:07Z

Weaknesses