---
id: "CVE-2023-43770"
kind: "vulnerability"
aliases: ["CVE-2023-43770"]
title: "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\u2026"
severity: "high"
cvss: 6.1
epss: null
exploited: true
status: "open"
category: "package"
products: [{"name": "roundcube webmail", "fixed": ["1.4.14"], "affected": "< 1.4.14", "ecosystem": "vendor"}, {"name": "roundcube webmail", "fixed": ["1.5.4"], "affected": ">= 1.5.0, < 1.5.4", "ecosystem": "vendor"}, {"name": "roundcube webmail", "fixed": ["1.6.3"], "affected": ">= 1.6.0, < 1.6.3", "ecosystem": "vendor"}, {"name": "debian linux", "fixed": [], "affected": "= 10.0", "ecosystem": "vendor"}, {"name": "Roundcube Webmail", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "package", "roundcube", "self-hosted", "webmail"]
not_affected_if: ["not-roundcube"]
published_at: "2023-09-22T06:15:10+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-24T00:09:51+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-43770", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-43770", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# 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…

Roundcube Webmail has a persistent cross-site scripting flaw triggered by malicious link references in plain-text email messages. An attacker who sends such an email can run script in a victim's webmail session and read information from it.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:roundcube webmail affected < 1.4.14 fixed 1.4.14
- vendor:roundcube webmail affected >= 1.5.0, < 1.5.4 fixed 1.5.4
- vendor:roundcube webmail affected >= 1.6.0, < 1.6.3 fixed 1.6.3
- vendor:debian linux affected = 10.0 fixed ?
- vendor:Roundcube Webmail affected ? fixed ?

## Fix

Apply the vendor mitigation per Roundcube's advisory, or discontinue use of Roundcube if mitigations are unavailable (per CISA KEV required action). Fixed version: unknown

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-43770
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2023-43770

## From the sources

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

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

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_