CVE-2020-13965

CVE-2020-13965 is a medium-severity (CVSS 6.1) vulnerability in Roundcube Webmail. CISA added it to the Known Exploited Vulnerabilities catalog on June 26, 2024, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by July 17, 2024. CISA does not currently list it as used in ransomware campaigns. Roundcube has 11 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5. There is XSS via a malicious XML attachment because text/xml is among the allowed types for a preview.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

• https://github.com/DrunkenShells/Disclosures/tree/master/CVE-2020-13965-Cross%20Site-Scripting%20via%20Malicious%20XML%20Attachment-Roundcube
• https://github.com/roundcube/roundcubemail/commit/884eb611627ef2bd5a2e20e02009ebb1eceecdc3
• https://github.com/roundcube/roundcubemail/compare/1.4.4...1.4.5
• https://github.com/roundcube/roundcubemail/releases/tag/1.3.12
• https://github.com/roundcube/roundcubemail/releases/tag/1.4.5
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DLESQ4LPJGMSWHQ4TBRTVQRDG7IXAZCW/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ODPJXBHZ32QSP4MYT2OBCALYXSUJ47SK/
• https://roundcube.net/news/2020/06/02/security-updates-1.4.5-and-1.3.12