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CVE-2023-43770

Roundcube Webmail Persistent Cross-Site Scripting (XSS)

6.1 MEDIUMActively exploited (CISA KEV)EPSS 63.7%
  1. Published22 Sept 2023
  2. Added to CISA KEV12 Feb 2024
  3. Remediation due4 Mar 2024
Actively exploited (CISA KEV)

Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that can lead to information disclosure via malicious link references in plain/text messages.

Added to KEV: 12 Feb 2024Federal remediation due: 4 Mar 2024

Description

Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.

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 < 1.5.4 · ≥ 1.6.0 < 1.6.3 · < 1.4.14
Debian Linux10.0

Remediation

Fixed in
Roundcube Webmail≥ 1.5.4

References

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Frequently asked

Is CVE-2023-43770 being actively exploited?

Yes. CVE-2023-43770 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 12 Feb 2024.

How severe is CVE-2023-43770?

CVE-2023-43770 has a CVSS 3.1 base score of 6.1, rated medium. EPSS estimates a 63.7% probability of exploitation.

Which products are affected by CVE-2023-43770?

Affected products include Roundcube Webmail, Debian Linux.

How do I fix CVE-2023-43770?

Upgrade affected software to a fixed version, for example Roundcube Webmail 1.5.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-43770 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.