RoundCube Webmail Cross-Site Scripting Vulnerability (CVE-2024-42009)
Severity: critical · Patch status: unknown · Since 2025-06-09 · CVE-2024-42009
RoundCube Webmail contains a cross-site scripting vulnerability. This vulnerability could allow a remote attacker to steal and send emails of a victim via a crafted e-mail message that abuses a Desanitization issue in messagebody() in program/actions/mail/show.php. CISA added CVE-2024-42009 to its Known Exploited Vulnerabilities catalog on Jun 9, 2025, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Jun 30, 2025 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch