How severe is CVE-2023-43770?

CVE-2023-43770 has a CVSS 3.1 base score of 6.1 (MEDIUM). EPSS estimates a 63.7% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2023-43770: Roundcube Webmail Persistent Cross-Site Scripting

CISA Known Exploited Vulnerabilities

Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2024-02-12

Remediation due

2024-03-04

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

CISA notes
https://roundcube.net/news/2023/09/15/security-update-1.6.3-released ; https://nvd.nist.gov/vuln/detail/CVE-2023-43770

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.

Severity

CVSS 3.1 · CISA6.1 MEDIUM

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

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impactpartial

Affected Products

Vendor	Product	Affected versions
-	-	n/a

References

3 Links

Mailing lists

[debian-lts-announce] 20230922 [SECURITY] [DLA 3577-1] roundcube security update

Other references

Record Details

Published

2023-09-22

Last updated

2025-10-21

Assigner (CNA)

mitre

Credited to

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.