A vulnerability was discovered in roundcube, a skinnable AJAX based webmail solution for IMAP servers. HTML messages with malicious svg or math content can exploit a Cross-site scripting (XSS) vulnerability.

For Debian 9 stretch, this problem has been fixed in version 1.2.3+dfsg.1-4+deb9u7.

We recommend that you upgrade your roundcube packages.

For the detailed security status of roundcube please refer to its security tracker page at: https://security-tracker.debian.org/tracker/roundcube

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS