June 9, 2025 · Applied Cybernetics Group
CVE-2024-42009 — Roundcube Webmail
RoundCube Webmail Cross-Site Scripting Vulnerability
- Added to KEV
2025-06-09- Federal due date
2025-06-30- Vendor
- Roundcube
- Product
- Webmail
- EPSS
- 99.7th percentile (score 0.912, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2024-42009
CISA short description
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 message_body() in program/actions/mail/show.php.
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.