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Fencer Vulns
medium 6.1

CVE-2023-5631 kev in the critical feed json

Stored XSS vulnerability in Roundcube

published 2023-10-18 3 y ago modified 2026-06-17 4 mo ago also BIT-roundcube-2023-5631 , EUVD-2023-57924

cvss
6.1
version 3.1, CNA
cisa kev
Exploited
added 2023-10-26
epss
76.3%
EPSS 76.3% chance of exploitation in 30 days, percentile 99.5%
public exploits
0
none known

Summary

Roundcube before 1.4.15, 1.5.x before 1.5.5, and 1.6.x before 1.6.4 allows stored XSS via an HTML e-mail message with a crafted SVG document because of program/lib/Roundcube/rcube_washtml.php behavior. This could allow a remote attacker

to load arbitrary JavaScript code.

Patch / fix

cisa required action Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  • bitnami roundcube 1.4.15, 1.5.5, 1.6.4
  • Roundcube Roundcubemail 1.5.4, 1.5.5, 1.5.14, 1.5.15, 1.6.3, 1.6.4
  • roundcube Debian 12 1.6.4+dfsg-1~deb12u1
  • roundcube Debian 14, Debian 13 1.6.4+dfsg-1

debian advisories DEBIAN-CVE-2023-5631

  • roundcube Ubuntu Pro 18.04 LTS 1.3.6+dfsg.1-1ubuntu0.1~esm4
  • roundcube Ubuntu Pro 20.04 LTS 1.4.3+dfsg.1-1ubuntu0.1~esm4
  • roundcube Ubuntu Pro 22.04 LTS 1.5.0+dfsg.1-2ubuntu0.1~esm3

ubuntu advisories UBUNTU-CVE-2023-5631

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 openSUSE Tumbleweed 1.6.4-1.1
  • roundcubemail Package Hub 15 SP5, openSUSE Leap 15.5 1.6.4-bp155.2.6.1

opensuse advisories openSUSE-SU-2024:13365-1openSUSE-SU-2023:0345-1

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-2023-5631 updated cvss 5.4

roundcube: cross-site scripting (XSS) vulnerability in handling of SVG in HTML messages

  • 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 SSVC: exploitation active
  4. CISA patch deadline

Known exploited

Added
3 y ago
Patch by
2023-11-16 (2 y ago)
Ransomware
Not known
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vendor, product
Roundcube, Webmail
CISA name
Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability

ATT&CK techniques

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

  • T1204.001 Malicious Link exploitation
  • T1059.007 JavaScript primary impact
  • T1041 Exfiltration Over C2 Channel secondary 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
2 y ago

Exploit prediction

76.34% chance of exploitation in the next 30 days, higher than 99.5% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/roundcube/roundcubemail/issues/9168 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
OSV 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami roundcube
<1.4.15
>=1.5.0, <1.5.5
>=1.6.0, <1.6.4
1.4.15
1.5.5
1.6.4

Affected products

  • Roundcube Roundcubemail

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.