What is CVE-2018-19206?

CVE-2018-19206 is a medium-severity vulnerability in Roundcube Webmail, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-11-12.

How severe is CVE-2018-19206?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Roundcube Webmail

CVE-2018-19206

steps/mail/func.inc in Roundcube before 1.3.8 has XSS via crafted use of <svg><style>, as demonstrated by an onload attribute in a BODY element, within an HTML attachment.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-11-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.559 (99.0th percentile), scored 2026-10-28.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.559 · newest: 0.559 · change: 0.000

Affected products

Roundcube Webmail
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/roundcube/roundcubemail/releases/tag/1.3.8 (Release Notes)
www.debian.org/security/2018/dsa-4344 (vendor-advisory, Third Party Advisory)
roundcube.net/news/2018/10/26/update-1.3.8-released (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2018-19206?: CVE-2018-19206 is a medium-severity vulnerability in Roundcube Webmail, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-11-12.
How severe is CVE-2018-19206?: Medium severity. CVSS v3 base score is 6.1 out of 10.