CVE-2024-42009

Name: CVE-2024-42009
Creator: NVD / NIST
Published: 2024-08-05T19:15:38.22+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.3/10Actively ExploitedEPSS 82.85%

Last modified Jun 17, 2026

CVE-2024-42009 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 82.85% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

EPSS Probability

82.85%

99.6th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jun 30, 2025.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Roundcube	Webmail	< 1.5.8
Roundcube	Webmail	>= 1.6.0, < 1.6.8

References

https://github.com/roundcube/roundcubemail/releasesRelease Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.5.8Release Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.6.8Release Notes
https://roundcube.net/news/2024/08/04/security-updates-1.6.8-and-1.5.8Vendor Advisory
https://sonarsource.com/blog/government-emails-at-risk-critical-cross-site-scripting-vulnerability-in-roundcube-webmail/Technical Description, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-42009US Government Resource

Timeline

Published: Aug 5, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-42009?

How severe is CVE-2024-42009?

CVE-2024-42009 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 82.85% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2024-42009?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-42009?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST