Description
An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. 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.
Published: 2026-04-03
Score: 5.4 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Information Disclosure and SSRF
Action: Immediate Patch
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories
Source ID Title
Debian DSA Debian DSA DSA-6196-1 roundcube security update
Github GHSA Github GHSA GHSA-vxg2-hhgr-37fx Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages
History

Sat, 04 Apr 2026 20:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 03 Apr 2026 10:15:00 +0000

Type Values Removed Values Added
Title Roundcube Webmail CSS Sanitization Issue Allows SSRF and Information Disclosure

Fri, 03 Apr 2026 05:15:00 +0000

Type Values Removed Values Added
Description An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. 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.
First Time appeared Roundcube
Roundcube webmail
Weaknesses CWE-669
CPEs cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
Vendors & Products Roundcube
Roundcube webmail
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N'}


Subscriptions

Roundcube Webmail
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-04-03T12:52:38.240Z

Reserved: 2026-04-03T03:47:51.066Z

Link: CVE-2026-35540

cve-icon Vulnrichment

Updated: 2026-04-03T12:52:34.699Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-03T05:16:22.100

Modified: 2026-04-07T20:52:15.220

Link: CVE-2026-35540

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-03T09:15:54Z

Weaknesses