ESB-2026.4413

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4413 USN-8223-1: Roundcube Webmail vulnerabilities 30 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: Roundcube Webmail Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2024-38356 CVE-2024-42008 CVE-2024-42010 CVE-2019-15237 CVE-2024-38357 CVE-2026-25916 CVE-2026-26079 Original Bulletin: https://ubuntu.com/security/notices/USN-8223-1 Comment: CVSS (Max): 9.3 CVE-2024-42008 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N) CVSS Source: Ubuntu Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N EPSS (Max): 57.3% (98th) CVE-2024-42008 2026-04-29 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-8223-1: Roundcube Webmail vulnerabilities Publication date 29 April 2026 Overview Several security issues were fixed in Roundcube Webmail. Releases 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS 16.04 LTS --------------------------------------------------------------------------------- Open side navigation Packages o 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 Package Version Release 24.04 roundcube-core - 1.6.6+dfsg-2ubuntu0.1+esm3 Ubuntu Pro Fix available LTS with Ubuntu Pro via ESM Apps. A community fix might become publicly noble available in the future. roundcube-core - 1.5.0+dfsg.1-2ubuntu0.1~esm6 Ubuntu Pro Fix 22.04 available with Ubuntu Pro via ESM Apps. A community fix might become LTS publicly available in the future. jammy roundcube-plugins - 1.5.0+dfsg.1-2ubuntu0.1~esm6 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. roundcube-core - 1.4.3+dfsg.1-1ubuntu0.1~esm8 Ubuntu Pro Fix 20.04 available with Ubuntu Pro via ESM Apps. A community fix might become LTS publicly available in the future. focal roundcube-plugins - 1.4.3+dfsg.1-1ubuntu0.1~esm8 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. roundcube-core - 1.3.6+dfsg.1-1ubuntu0.1~esm8 Ubuntu Pro Fix 18.04 available with Ubuntu Pro via ESM Apps. A community fix might become LTS publicly available in the future. bionic roundcube-plugins - 1.3.6+dfsg.1-1ubuntu0.1~esm8 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. roundcube-core - 1.2~beta+dfsg.1-0ubuntu1+esm8 Ubuntu Pro Fix 16.04 available with Ubuntu Pro via ESM Apps. A community fix might become LTS publicly available in the future. xenial roundcube-plugins - 1.2~beta+dfsg.1-0ubuntu1+esm8 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. --------------------------------------------------------------------------------- References o CVE-2026-26079 o CVE-2026-25916 o CVE-2024-42010 o CVE-2024-42008 o CVE-2024-38357 o CVE-2024-38356 o CVE-2019-15237 - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. 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