Which products and versions are affected by CVE-2023-5631?

Affected: Webmail (Roundcube); Debian Linux versions 10.0, 11.0, 12.0; Fedora (Fedoraproject) versions 39, among others. The full list is in the CVE brief.

Is CVE-2023-5631 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 25, 2023.

Is CVE-2023-5631 in the CISA KEV catalog?

Yes. It was added on Oct 26, 2023 with a federal remediation due date of Nov 16, 2023.

Is there a public exploit for CVE-2023-5631?

Public exploit code is available.

Is there a fix for CVE-2023-5631?

Fixed versions are available, including roundcube 1.2~beta+dfsg.1-0ubuntu1+esm4, roundcube 1.3.17+dfsg.1-1~deb10u4, roundcube 1.3.6+dfsg.1-1ubuntu0.1~esm4.

How urgently should CVE-2023-5631 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2023-5631

MediumExploitedPublic exploit

roundcube - security update

Published Oct 27, 2023 · Updated Sep 17, 2026 · Also known as BIT-roundcube-2023-5631, DEBIAN-CVE-2023-5631, DLA-3630-1, DSA-5531-1, TR-23-0607, UBUNTU-CVE-2023-5631

Key Facts

Patch immediately

CVE-2023-5631 is a medium-severity vulnerability (CVSS 5.4 v3.1) affecting Webmail (Roundcube), Debian Linux, Fedora (Fedoraproject) and 2 more products.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 25, 2023. Public exploit code is available.
EPSS estimates a 76% probability of exploitation in the next 30 days.
Fixed versions are available, including roundcube 1.2~beta+dfsg.1-0ubuntu1+esm4, roundcube 1.3.17+dfsg.1-1~deb10u4, roundcube 1.3.6+dfsg.1-1ubuntu0.1~esm4.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

5.4

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS (30-day exploit likelihood)

76%

Higher than 99.5% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2023-5631 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

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.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Oct 26, 2023	Nov 16, 2023	Not reported
Industry KEV feed	Oct 25, 2023	Nov 16, 2023	Not reported
CIRCL KEV	Oct 26, 2023	Nov 16, 2023	Not reported
ENISA EUVD	Oct 26, 2023	n/a	Not reported

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

Affected Products

28 affected entries in total

Product	Affected versions	Fixed in
WebmailRoundcube	See advisory	1.4.15
Debian LinuxDebian	10.0, 11.0, 12.0	n/a
FedoraFedoraproject	39	n/a
roundcubebitnami	See advisory	1.4.15
Roundcubemailsuse	>= 1.6.0	1.6.4-bp155.2.6.1

Patched Releases

roundcube

1.2~beta+dfsg.1-0ubuntu1+esm4, 1.3.17+dfsg.1-1~deb10u4, 1.3.6+dfsg.1-1ubuntu0.1~esm4, 1.4.15, 1.4.15+dfsg.1-1~deb11u1, 1.4.3+dfsg.1-1ubuntu0.1~esm4, 1.5.0+dfsg.1-2ubuntu0.1~esm3, 1.5.5, 1.6.4, 1.6.4+dfsg-1, 1.6.4+dfsg-1~deb12u1

Webmail

1.4.15

Roundcubemail

1.6.4-1.1, 1.6.4-bp155.2.6.1, 1.5.14, 1.5.4, 1.6.3

Timeline

Added to Industry KEV feed
Oct 25, 2023
Added to CISA KEV
Oct 26, 2023
Added to CIRCL KEV
Oct 26, 2023
Added to ENISA EUVD
Oct 26, 2023
Publicly disclosed
Oct 27, 2023
Last updated
Sep 17, 2026

Weakness Type

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References

15 more references in the full CVE brief

FAQ

Common Questions.

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.
Affected: Webmail (Roundcube); Debian Linux versions 10.0, 11.0, 12.0; Fedora (Fedoraproject) versions 39, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 25, 2023.
Yes. It was added on Oct 26, 2023 with a federal remediation due date of Nov 16, 2023.
Public exploit code is available.
Fixed versions are available, including roundcube 1.2~beta+dfsg.1-0ubuntu1+esm4, roundcube 1.3.17+dfsg.1-1~deb10u4, roundcube 1.3.6+dfsg.1-1ubuntu0.1~esm4.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2023-5631 Running On Your Attack Surface?

Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.