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CVE-2023-43770

MediumPublished

Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability

Published: Sep 22, 2023
Updated: Oct 21, 2025
Assigning CNA: mitre
Evidence observed: Feb 12, 2024

Primary CVSS

6.1/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

58.5%

High · next 30 days

Percentile: 99.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

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.

Sources

CVE-2023-43770-POCPoC
A Proof-Of-Concept for the CVE-2023-43770 vulnerability.
CVE-2023-43770-PoCPoC
PoC for Stored XSS (CVE-2023-43770) Vulnerability
CVE-2021-44026-PoCPoC
Bug Chain XSS (CVE-2020-35730 and CVE-2023-43770) to SQLi (CVE-2021-44026)

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