CVE Watch—

CVE-2024-42009

RoundCube Webmail Cross-Site Scripting Vulnerability

CVSS

—

No CVSS

EPSS

82.9%

p100

KEV

YES

Jun 9, 2025

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

82.9%EPSS · 30 days82.9%

2026-09-162026-10-14

KEV catalog record

Product

Roundcube / Webmail

Vulnerability

RoundCube Webmail Cross-Site Scripting Vulnerability

Added to KEV

Jun 9, 2025

Remediate by

Jun 30, 2025

Known ransomware use

Summary 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.

Notes

https://roundcube.net/news/2024/08/04/security-updates-1.6.8-and-1.5.8 ; https://nvd.nist.gov/vuln/detail/CVE-2024-42009

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