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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

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 < 1.6.18
1.7.0 affected < 1.7.3

No data.

No data.

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Vendors Products
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Webmail Subscribe

Project Subscriptions

Vendors Products
Roundcube Subscribe
Webmail Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/roundcube/roundcubemail/commit/7e10ca0110b7c9aa1b7850b843bb6625e47bbe00 cve-icon cve-icon
https://github.com/roundcube/roundcubemail/commit/8a92380b06b5df1481e034c4f40d6a6546c21223 cve-icon cve-icon
https://github.com/roundcube/roundcubemail/commit/92f85c883594e5be757154f94548a9ba903455c9 cve-icon cve-icon
https://github.com/roundcube/roundcubemail/commit/c111b72950cd2bf57d6b86cd129568d90403322d cve-icon cve-icon
https://github.com/roundcube/roundcubemail/releases/tag/1.6.18 cve-icon cve-icon
https://github.com/roundcube/roundcubemail/releases/tag/1.7.3 cve-icon cve-icon
https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3 cve-icon cve-icon
History

Mon, 17 Aug 2026 15:15:00 +0000

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

Mon, 17 Aug 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Mon, 17 Aug 2026 13:15:00 +0000

Type Values Removed Values Added
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.
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': 5.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-08-17T14:06:46.947Z

Reserved: 2026-08-17T12:56:46.553Z

Link: CVE-2026-75006

cve-icon Vulnrichment

Updated: 2026-08-17T14:06:42.463Z

cve-icon NVD

Status : Received

Published: 2026-08-17T13:16:55.240

Modified: 2026-08-17T14:20:22.273

Link: CVE-2026-75006

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-17T17:00:04Z

Weaknesses