Description
steps/utils/modcss.inc in Roundcube Webmail before 0.5.1 does not properly verify that a request is an expected request for an external Cascading Style Sheets (CSS) stylesheet, which allows remote authenticated users to trigger arbitrary outbound TCP connections from the server, and possibly obtain sensitive information, via a crafted request.
Remediation
References
Related Vulnerabilities
WordPress 4.7.x Cross-Domain Flash Injection Vulnerability (4.7 - 4.7.8)
WordPress Plugin Booking Calendar SQL Injection (8.4.4)
WordPress Plugin Check & Log Email Cross-Site Scripting (1.0.3)
MySQL CVE-2021-35612 Vulnerability (CVE-2021-35612)
WordPress Plugin User Activity Log Multiple Cross-Site Scripting Vulnerabilities (1.4.6)