CVE-2026-48843

Insufficient CSS Sanitization in Roundcube Webmail Enables SSRF or Information Disclosure

Published May 25, 2026 CVSS 3.1 · 7.2 High EPSS < 1% KEV · Not listed
Description
Roundcube Webmail 1.6.x between 1.6.14 and 1.6.16,and 1.7.x before 1.7.1 has 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. The issue stems from an insufficient fix for CVE-2026-35540.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4604-1 roundcube security update
Debian DLA Debian DLA DLA-4693-1 roundcube security update
Debian DLA Debian DLA DLA-4760-1 roundcube security update
Debian DLA Debian DLA DLA-4823-1 roundcube security update
Debian DSA Debian DSA DSA-6301-1 roundcube security update
History
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
Title Insufficient CSS Sanitization in Roundcube Webmail Enables SSRF or Information Disclosure
Type Values Removed Values Added
Description Roundcube Webmail 1.6.x between 1.6.14 and 1.6.16,and 1.7.x before 1.7.1 has 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. The issue stems from an insufficient fix for CVE-2026-35540.
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
May 26, 2026, 12:50 PM
Reserved
May 25, 2026, 7:11 PM
Status
Deferred
Published
May 25, 2026, 8:16 PM
Modified
Jul 24, 2026, 10:10 AM