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

Yes. CVE-2023-5631 is on the CISA Known Exploited Vulnerabilities list, added 2023-10-26.

What is the CVSS severity of CVE-2023-5631?

CVE-2023-5631 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2023-5631?

CVE-2023-5631 has an EPSS score of 75.87% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-5631?

Upgrade roundcube on debian 11 to 1.4.15+dfsg.1-1~deb11u1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2023-5631

MEDIUMCISA KEVEPSS 99th pctl

6.1

CVSS v3

NVD

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.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

roundcubeDebian

Fixed in:1.4.15+dfsg.1-1~deb11u1CVE-2023-5631

Fixed in:1.6.4+dfsg-1~deb12u1CVE-2023-5631

Fixed in:1.6.4+dfsg-1CVE-2023-5631

roundcubeUbuntu

Fixed in:1.2~beta+dfsg.1-0ubuntu1+esm4USN-6848-1

Fixed in:1.3.6+dfsg.1-1ubuntu0.1~esm4USN-6848-1

Fixed in:1.4.3+dfsg.1-1ubuntu0.1~esm4USN-6848-1

Fixed in:1.5.0+dfsg.1-2ubuntu0.1~esm3USN-6848-1

Fixed in:1.6.2+dfsg-1ubuntu0.2USN-6848-1

roundcube-coreUbuntu

Fixed in:1.2~beta+dfsg.1-0ubuntu1+esm4USN-6848-1

Fixed in:1.3.6+dfsg.1-1ubuntu0.1~esm4USN-6848-1

Fixed in:1.4.3+dfsg.1-1ubuntu0.1~esm4USN-6848-1

Fixed in:1.5.0+dfsg.1-2ubuntu0.1~esm3USN-6848-1

Fixed in:1.6.2+dfsg-1ubuntu0.2USN-6848-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

75.87%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability

Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that allows a remote attacker to run malicious JavaScript code.

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

Remediation due: 2023-11-16

References

Patch3

Exploit1

github.com

Third-Party Advisory4

Government Resource1

cisa.gov

Mailing List2

Release Notes5

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-30.