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CVE-2023-5631

Roundcube Webmail Persistent Cross-Site Scripting (XSS)

6.1 MEDIUMActively exploited (CISA KEV)Public exploitEPSS 75.9%
  1. Published18 Oct 2023
  2. Added to CISA KEV26 Oct 2023
  3. Remediation due16 Nov 2023
Actively exploited (CISA KEV)

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

Added to KEV: 26 Oct 2023Federal remediation due: 16 Nov 2023

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

Roundcube Webmail≥ 1.5.0 < 1.5.5 · ≥ 1.6.0 < 1.6.4 · < 1.4.15
Debian Linux10.0 · 11.0 · 12.0
Fedoraproject Fedora39

Remediation

Fixed in
Roundcube Webmail≥ 1.5.5

References

and 6 more references

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Frequently asked

Is CVE-2023-5631 being actively exploited?

Yes. CVE-2023-5631 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 26 Oct 2023.

How severe is CVE-2023-5631?

CVE-2023-5631 has a CVSS 3.1 base score of 6.1, rated medium. EPSS estimates a 75.9% probability of exploitation.

Which products are affected by CVE-2023-5631?

Affected products include Roundcube Webmail, Debian Linux, Fedoraproject Fedora.

How do I fix CVE-2023-5631?

Upgrade affected software to a fixed version, for example Roundcube Webmail 1.5.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-5631 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.