---
title: "Security digest: September 15, 2023"
url: https://erroneo.us/security/2023-09-15/
description: "September 15, 2023 vulnerability digest: 1 brief (Roundcube CVE-2023-43770: Plain-Text Email XSS…). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2023-09-15
date_modified: 2026-10-23
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: September 15, 2023

1 editorial brief.

## Take stock

- Check exposure: Roundcube CVE-2023-43770: Plain-Text Email XSS, Exploited . Anyone running Roundcube older than 1.6.3, 1.5.4 or 1.4.14, including copies bundled in hosting panels or old distribution packages, and anyone still on the unsupported 1.4 or 1.5 branches.
- None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

## Editorial briefs

- **Check exposure** [Roundcube CVE-2023-43770: Plain-Text Email XSS, Exploited](https://erroneo.us/security/briefs/roundcube-cve-2023-43770-plain-text-linkref-xss/index.md): Patched in September 2023 and used by a Russia-linked espionage campaign within two weeks; confirm every Roundcube is on 1.6.20 or 1.7.5, and if an old install was exposed in 2023 or 2024, look for mail-forwarding rules that an upgrade does not remove.

## Known exploited (CISA KEV)

None.

## Critical advisories

None.

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Source page: https://erroneo.us/security/2023-09-15/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt