# CVE-2023-43770: Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability

> CVE-2023-43770: Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability. CVSS 6.1 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2023-43770
Last updated: 2025-10-21T23:05:36Z

- Published: 2023-09-22 00:00 UTC · Updated: 2025-10-21 23:05 UTC · Assigner: mitre
- CVSS: 6.1 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS: 63.7%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2024-02-12, federal due date 2024-03-04, ransomware use: Unknown

## 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.

## CISA required action

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

## Affected vendors and products

- debian: debian\_linux
- roundcube: webmail

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2023-43770)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2023-43770)
- [https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49b](https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49b)
- [https://lists.debian.org/debian-lts-announce/2023/09/msg00024.html](https://lists.debian.org/debian-lts-announce/2023/09/msg00024.html)
- [https://roundcube.net/news/2023/09/15/security-update-1.6.3-released](https://roundcube.net/news/2023/09/15/security-update-1.6.3-released)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2023-43770 · Markdown: https://rewindex.com/cve/CVE-2023-43770.md · JSON: https://rewindex.com/api/v1/cves/CVE-2023-43770 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:14:52.547Z