Roundcube · Roundcube · CVE-2021-46144
**Name of the Vulnerable Software and Affected Versions**
Roundcube versions 1.4.13 and earlier, 1.5.x before 1.5.2
**Description**
The issue allows for cross-site scripting (XSS) attacks via crafted Cascading Style Sheets (CSS) token sequences in HTML e-mail messages. This can enable a remote attacker to conduct cross-site scripting attacks by sending a specially crafted email message. The vulnerability is related to the lack of protection measures for the web page structure when processing CSS styles.
**Recommendations**
For versions 1.4.13 and earlier, update to version 1.4.13 or later.
For versions 1.5.x before 1.5.2, update to version 1.5.2 or later.
As a temporary workaround, consider restricting the processing of CSS styles in HTML email messages until a patch is available.