It was discovered that roundcube, a skinnable AJAX based webmail
solution for IMAP servers, did not properly sanitize HTML
messages. This would allow an attacker to perform Cross-Side Scripting
For the oldstable distribution (buster), this problem has been fixed
in version 1.3.17+dfsg.1-1~deb10u2.
For the stable distribution (bullseye), this problem has been fixed in
We recommend that you upgrade your roundcube packages.