What’s Vulnerable › Vulnerabilities

CVE-2024-42009: RoundCube Webmail Cross-Site Scripting Vulnerability

• Severity: critical (CVSS 9.3 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-06-09
• EPSS: 82.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-08-05 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• Roundcube Webmail: before 1.5.8; from 1.6.0 before 1.6.8 — fixed in 1.5.8, 1.6.8

How to fix

Upgrade to a fixed version: Roundcube Webmail 1.5.8, 1.6.8. Check the vendor advisory for mitigations.

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

Get alerted when CVE-2024-42009 or the next vulnerability affects your stack