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Fencer Vulns
critical 9.3

CVE-2024-42009 kev in the critical feed json

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 o…

published 2024-08-05 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-39391

cvss
9.3
version 3.1, CNA
cisa kev
Exploited
added 2025-06-09
epss
82.9%
EPSS 82.9% chance of exploitation in 30 days, percentile 99.6%
public exploits
0
none known, plus a Nuclei check

Summary

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.

Patch / fix

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.

  • roundcube webmail 1.5.8, 1.6.8
  • roundcube Debian 12 1.6.5+dfsg-1+deb12u3
  • roundcube Debian 14, Debian 13 1.6.8+dfsg-1

debian advisories DEBIAN-CVE-2024-42009

  • roundcube Ubuntu Pro 24.04 LTS 1.6.6+dfsg-2ubuntu0.1+esm1

ubuntu advisories UBUNTU-CVE-2024-42009

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • roundcubemail Package Hub 15 SP6, Package Hub 15 SP5, openSUSE Leap 15.6 +1 more 1.6.8-bp156.2.3.1
  • roundcubemail openSUSE Tumbleweed 1.6.8-1.1

opensuse advisories openSUSE-SU-2024:0328-1openSUSE-SU-2024:14243-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-42009 updated cvss 9.3

roundcubemail: A Cross-Site Scripting vulnerability in Roundcube

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. Added to CISA KEV
  3. CISA patch deadline
  4. CISA SSVC: exploitation active

Known exploited

Added
17 mo ago
Patch by
2025-06-30 (16 mo ago)
Ransomware
Not known
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.
Vendor, product
Roundcube, Webmail
CISA name
RoundCube Webmail Cross-Site Scripting Vulnerability

ATT&CK techniques

How it is exploited and what it leads to, in MITRE ATT&CK terms.

  • T1566.002 Spearphishing Link exploitation
  • T1056 Input Capture primary impact
  • T1114 Email Collection primary impact

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
14 mo ago

Exploit prediction

82.88% chance of exploitation in the next 30 days, higher than 99.6% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
NVD 3.1 9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CNA 3.1 9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.