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CVE-2024-42009

96
FAUCET Score

CVE-2024-42009 is a critical Cross-Site Scripting (XSS) vulnerability affecting Roundcube webmail versions through 1.5.7 and 1.6.x through 1.6.7. This flaw allows a remote attacker to steal and send emails from a victim by crafting a malicious email that exploits a desanitization issue in the message_body() function. With a CVSS score of 9.3 (CRITICAL), it requires user interaction but has high impacts on confidentiality and integrity, with a high EPSS score indicating significant exploitability. This vulnerability is actively exploited in the wild, as confirmed by its inclusion in the KEV catalog and recent advisories from cybersecurity authorities, though public Metasploit or ExploitDB modules are not yet available. The high level of community discussion and media coverage underscore its critical nature and the urgency for immediate patching.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.5.8CPE matchmatch criteria
cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
>= 1.6.0, < 1.6.8CPE matchmatch criteria
cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.3CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
5.8
CvssVersion
3.1

Exploit Intelligence

EPSS Score
79.62%
Probability of exploitation in next 30 days
EPSS Percentile
99.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Jun 9, 2025
Nuclei: CVE-2024-42009 · Oct 14, 2025
This CVE's current EPSS score of 0.7962 is in the 100th percentile among its peer group of 834 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.8 Bluesky, 0.5 Mastodon, and 1.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
github.com / roundcube/roundcubemail/releases
Release Notes
github.com / roundcube/roundcubemail/releases/tag/1.5.8
Release Notes
github.com / roundcube/roundcubemail/releases/tag/1.6.8
Release Notes
roundcube.net / news/2024/08/04/security-updates-1.6.8-and-1.5.8
Vendor Advisory
sonarsource.com / blog/government-emails-at-risk-critical-cross-site-scripting-vulnerability-in-roundcube-webmail
Technical DescriptionThird Party Advisory