CVE-2020-13965
Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability
Roundcube Webmail
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.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 26 June 2024. US federal agencies were required to remediate it by 17 July 2024.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 76.6%, which is higher than 99.5% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Frequently asked questions
Is CVE-2020-13965 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2020-13965.
What does CVE-2020-13965 affect?
CVE-2020-13965 affects Roundcube Webmail. 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.
How severe is CVE-2020-13965?
CVE-2020-13965 is rated MEDIUM with a CVSS base score of 6.1. EPSS puts the probability of exploitation in the next 30 days at 76.6%, higher than 99.5% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 17 July 2024.
How should organisations respond to CVE-2020-13965?
Apply the vendor patch for Roundcube Webmail as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.