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CVE-2024-42009

RoundCube Webmail Cross-Site Scripting

9.3 CRITICALActively exploited (CISA KEV)EPSS 82.9%
  1. Published5 Aug 2024
  2. Added to CISA KEV9 Jun 2025
  3. Remediation due30 Jun 2025
Actively exploited (CISA KEV)

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.

Added to KEV: 9 Jun 2025Federal remediation due: 30 Jun 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected products

Roundcube Webmail≥ 1.6.0 < 1.6.8 · < 1.5.8

Remediation

Fixed in
Roundcube Webmail≥ 1.6.8

References

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Frequently asked

Is CVE-2024-42009 being actively exploited?

Yes. CVE-2024-42009 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 9 Jun 2025.

How severe is CVE-2024-42009?

CVE-2024-42009 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 82.9% probability of exploitation.

Which products are affected by CVE-2024-42009?

Affected products include Roundcube Webmail.

How do I fix CVE-2024-42009?

Upgrade affected software to a fixed version, for example Roundcube Webmail 1.6.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2024-42009 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.