CVE-2024-42009
Published 2024-08-05 · Updated 2026-06-17 · Source cve@mitre.org
Summary
CVE-2024-42009 is a critical-severity (CVSS 9.3) vulnerability in Roundcube Webmail. CISA added it to the Known Exploited Vulnerabilities catalog on June 9, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by June 30, 2025. CISA does not currently list it as used in ransomware campaigns. Roundcube has 11 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.
All 11 known-exploited Roundcube vulnerabilities →Description
A Cross-Site Scripting vulnerability in Roundcube through 1.5.7 and 1.6.x through 1.6.7 allows 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.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CISA Known-Exploited Vulnerability
Product: Roundcube — Webmail
Name: RoundCube Webmail Cross-Site Scripting Vulnerability
Date added: 2025-06-09 · Due: 2025-06-30
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.
References
- https://github.com/roundcube/roundcubemail/releases
- https://github.com/roundcube/roundcubemail/releases/tag/1.5.8
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.8
- https://roundcube.net/news/2024/08/04/security-updates-1.6.8-and-1.5.8
- https://sonarsource.com/blog/government-emails-at-risk-critical-cross-site-scripting-vulnerability-in-roundcube-webmail/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-42009