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CVE-2024-42009: RoundCube Webmail Cross-Site Scripting Vulnerability
Roundcube Webmail · in CISA KEV since 2025-06-09
2025-06-09added to KEV
2025-06-30federal remediation due date
82.88%EPSS exploit probability (30 days) 99.7th percentile
9.3 CRITICALCVSS 3.1
Unknownknown ransomware use
308days from NVD publication to KEV
What it is
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 (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
| CWE | CWE-79 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N |
| NVD published | 2024-08-05 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2024-42009.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.