How severe is CVE-2024-42009?

CVE-2024-42009 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2024-42009 being actively exploited?

Yes. CVE-2024-42009 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-06-09, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2024-42009?

CVE-2024-42009 affects Roundcube Webmail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-42009?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2024-42009 have an EU (EUVD) identifier?

Yes. CVE-2024-42009 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-39391. It is also flagged as exploited in the EUVD (since 2025-06-09).

When was CVE-2024-42009 published?

CVE-2024-42009 was published on 2024-08-05 and last updated on 2026-06-17.

CVE-2024-42009

CVE-2024-42009 is a critical-severity vulnerability in Roundcube Webmail with a CVSS 3.x base score of 9.3. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2025-06-09). The underlying weakness is classified as CWE-79.

Key facts

Severity: Critical (CVSS 3.x base score 9.3)
EPSS exploit prediction: 83% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2025-06-09)
EU (EUVD) id: EUVD-2024-39391
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2025-06-09)
Weakness: CWE-79
Affected product: Roundcube Webmail
Published: 2024-08-05
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2024-42009?: 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.
How severe is CVE-2024-42009?: CVE-2024-42009 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2024-42009 being actively exploited?: Yes. CVE-2024-42009 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-06-09, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2024-42009?: CVE-2024-42009 affects Roundcube Webmail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-42009?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2024-42009 have an EU (EUVD) identifier?: Yes. CVE-2024-42009 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-39391. It is also flagged as exploited in the EUVD (since 2025-06-09).
When was CVE-2024-42009 published?: CVE-2024-42009 was published on 2024-08-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*

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