Is CVE-2024-42009 in the CISA KEV catalog?

Yes. CVE-2024-42009 is on the CISA Known Exploited Vulnerabilities list, added 2025-06-09.

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

CVE-2024-42009 has a CVSS v3 base score of 9.3 (CRITICAL).

What is the EPSS score for CVE-2024-42009?

CVE-2024-42009 has an EPSS score of 84.45% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-42009?

Upgrade roundcube on debian 11 to 1.4.15+dfsg.1-1+deb11u4 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2024-42009

CRITICALCISA KEVEPSS 100th pctl

9.3

CVSS v3

NVD

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.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

roundcubeDebian

Fixed in:1.4.15+dfsg.1-1+deb11u4CVE-2024-42009

Fixed in:1.6.5+dfsg-1+deb12u3CVE-2024-42009

Fixed in:1.6.8+dfsg-1CVE-2024-42009

roundcubeUbuntu

Fixed in:1.6.6+dfsg-2ubuntu0.1+esm1USN-7636-1

roundcube-coreUbuntu

Fixed in:1.6.6+dfsg-2ubuntu0.1+esm1USN-7636-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

84.45%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

RoundCube Webmail Cross-Site Scripting Vulnerability

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.

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Remediation due: 2025-06-30

References

Vendor Advisory1

roundcube.net

Third-Party Advisory1

sonarsource.com

Government Resource1

cisa.gov

Release Notes3

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-04.