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[USN-8223-1] Roundcube Webmail vulnerabilities

Posted on 29 April 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8223-1
April 29, 2026

roundcube vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Roundcube Webmail.

Software Description:
- roundcube: skinnable AJAX based webmail solution for IMAP servers - metapackage

Details:

It was discovered that Roundcube Webmail mishandled Punycode xn-- domain names.
An attacker could possibly use this issue to cause a homograph attack. (CVE-2019-15237)

It was discovered that Roundcube Webmail did not properly sanitize certain
attributes when handling CSS within HTML messages and certain SVG attributes.
An attacker could possibly use this issue to cause a cross-site scripting attack.
(CVE-2024-38356, CVE-2024-38357)

It was discovered that Roundcube Webmail did not properly sanitize certain HTML
attributes when rendering e-mail messages. An attacker could possibly use this
issue to cause a cross-site scripting attack. (CVE-2024-42008)

It was discovered that Roundcube Webmail did not properly filter certain CSS token
sequences within rendered e-mail messages. An attacker could possibly use this
issue to obtain sensitive information. (CVE-2024-42010)

It was discovered that Roundcube Webmail did not properly treat an SVG
tag as an image source within its HTML sanitizer. An attacker could possibly use
this issue to bypass remote image blocking to track email open actions or
potentially bypass access control. (CVE-2026-25916)

It was discovered that Roundcube Webmail did not properly handle comments within
Cascading Style Sheets (CSS). An attacker could possibly use this issue to perform
a CSS injection attack. (CVE-2026-26079)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
roundcube-core 1.6.6+dfsg-2ubuntu0.1+esm3
Available with Ubuntu Pro

Ubuntu 22.04 LTS
roundcube-core 1.5.0+dfsg.1-2ubuntu0.1~esm6
Available with Ubuntu Pro
roundcube-plugins 1.5.0+dfsg.1-2ubuntu0.1~esm6
Available with Ubuntu Pro

Ubuntu 20.04 LTS
roundcube-core 1.4.3+dfsg.1-1ubuntu0.1~esm8
Available with Ubuntu Pro
roundcube-plugins 1.4.3+dfsg.1-1ubuntu0.1~esm8
Available with Ubuntu Pro

Ubuntu 18.04 LTS
roundcube-core 1.3.6+dfsg.1-1ubuntu0.1~esm8
Available with Ubuntu Pro
roundcube-plugins 1.3.6+dfsg.1-1ubuntu0.1~esm8
Available with Ubuntu Pro

Ubuntu 16.04 LTS
roundcube-core 1.2~beta+dfsg.1-0ubuntu1+esm8
Available with Ubuntu Pro
roundcube-plugins 1.2~beta+dfsg.1-0ubuntu1+esm8
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8223-1
CVE-2019-15237, CVE-2024-38356, CVE-2024-38357, CVE-2024-42008,
CVE-2024-42010, CVE-2026-25916, CVE-2026-26079

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