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CVE-2024-42009VulnerabilityAdded to KEV 06/09/2025

CVE-2024-42009: RoundCube Webmail Cross-Site Scripting Vulnerability

Affects Roundcube WebmailSource CISA KEV

0

Exploited in the wild · KEV due 30 Jun 2025 · public detection template (Nuclei) · 82% EPSS : apply the vendor's fix or mitigations to Roundcube Webmail now.

Data as of 10/24/2026, 22:16:00 UTC

CVSS 3.1 base score
9.3Critical
How severe the flaw is on the 0–10 CVSS scale.
Exploitation

Actively exploited – in CISA KEV since 06/09/2025

KEV deadline
06/30/2025 US federal agencies must patch by this date; a sensible deadline for everyone else.
EPSS
82.8% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Public exploits
a Nuclei detection templatePublic attack or detection tooling exists; see Public exploits below.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

What to do

CISA required action

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

Public exploits and detection

Public tooling indexed from Metasploit Framework, Exploit-DB and ProjectDiscovery nuclei-templates. Its existence raises the odds of exploitation; it does not confirm attacks.

Description

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.

Weaknesses

References

Community reviews

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