Description
An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. XSS exists because of insufficient HTML attachment sanitization in preview mode. A victim must preview a text/html attachment.
Published: 2026-04-03
Score: 6.1 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Cross‑Site Scripting
Action: Apply 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

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6196-1 roundcube security update
Github GHSA Github GHSA GHSA-x4q5-8j5g-hpjc Roundcube Webmail: Insufficient HTML attachment sanitization in preview mode
History

Wed, 08 Apr 2026 20:15:00 +0000

Type Values Removed Values Added
Title Cross‑Site Scripting via Previewing HTML Attachments in Roundcube

Tue, 07 Apr 2026 21:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*

Fri, 03 Apr 2026 15:15:00 +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 Cross‑Site Scripting via Previewing HTML Attachments in Roundcube
First Time appeared Roundcube
Roundcube webmail
Vendors & Products Roundcube
Roundcube webmail

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

Type Values Removed Values Added
Description An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. XSS exists because of insufficient HTML attachment sanitization in preview mode. A victim must preview a text/html attachment.
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}


Subscriptions

Roundcube Webmail
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-04-03T13:10:55.717Z

Reserved: 2026-04-03T03:39:16.997Z

Link: CVE-2026-35539

cve-icon Vulnrichment

Updated: 2026-04-03T13:10:52.287Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-03T05:16:21.920

Modified: 2026-04-07T20:53:07.750

Link: CVE-2026-35539

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-08T19:54:23Z

Weaknesses