Is CVE-2024-42009 actively exploited?

Yes. CVE-2024-42009 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2024-42009 be exploited remotely?

The attack vector of CVE-2024-42009 has not been classified yet.

What is the CVSS score of CVE-2024-42009?

CVE-2024-42009 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2024-42009

HIGHCISA KEVIN THE WILD

CVE-2024-42009

Published: June 9, 2025

EPSS:91.22%probability of exploitation in 30 daysPercentile:99.6th

Official 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.

NVD Source

CISA KEV Advisory

RoundCube Webmail Cross-Site Scripting Vulnerability

Added to KEV: 2025-06-09Federal patch deadline: 2025-06-30

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.

Risk Analysis

This cross-site scripting (XSS) vulnerability in RoundCube Webmail allows a remote attacker to steal or send emails of a victim. By sending a specially crafted email that abuses a desanitization issue, an attacker can execute malicious scripts in the victim's browser. The high EPSS score of 0.91224 indicates a very high likelihood of exploitation, making this a critical vulnerability. Its presence in CISA's KEV catalog confirms it has been actively exploited.

This vulnerability is actively exploited in the wild. It is remotely exploitable, requiring a victim to open a crafted email.

Recommended Action

Apply the latest security patches or upgrades for RoundCube Webmail to address this XSS vulnerability. Ensure proper input sanitization and output encoding are implemented for all user-supplied content.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2024-42009 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2024-42009 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.