How severe is CVE-2023-43770?

CVE-2023-43770 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2023-43770 being actively exploited?

Yes. CVE-2023-43770 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-02-12, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2023-43770?

CVE-2023-43770 primarily affects Roundcube Webmail. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-43770?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2023-43770 have an EU (EUVD) identifier?

Yes. CVE-2023-43770 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-48147. It is also flagged as exploited in the EUVD (since 2024-02-12).

When was CVE-2023-43770 published?

CVE-2023-43770 was published on 2023-09-22 and last updated on 2026-06-17.

CVE-2023-43770

CVE-2023-43770 is a medium-severity vulnerability in Roundcube Webmail with a CVSS 3.x base score of 6.1. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2024-02-12). The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 58% (99th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2024-02-12)
EU (EUVD) id: EUVD-2023-48147
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2024-02-12)
Weakness: CWE-79
Affected product: Roundcube Webmail
Published: 2023-09-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-43770?: 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.
How severe is CVE-2023-43770?: CVE-2023-43770 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2023-43770 being actively exploited?: Yes. CVE-2023-43770 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-02-12, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2023-43770?: CVE-2023-43770 primarily affects Roundcube Webmail. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-43770?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2023-43770 have an EU (EUVD) identifier?: Yes. CVE-2023-43770 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-48147. It is also flagged as exploited in the EUVD (since 2024-02-12).
When was CVE-2023-43770 published?: CVE-2023-43770 was published on 2023-09-22 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

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