Roundcube security advisory (AV26-503) – Update 1

Serial number: AV26-503Date: May 25, 2026Updated: September 21, 2026 On May 24, 2026, Roundcube published security advisories to address vulnerabilities in the following product:  Roundcube Webmail – versions prior to 1.6.16 Roundcube Webmail – versions prior to 1.7.1 Update 1 Open-source reporting indicates that CVE-2026-48842 is being exploited in the wild. The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary updates. Roundcube Webmail 1.6.16 Roundcube Webmail 1.71 Roundcube Open Source Webmail Software