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

Source: https://junglewise.ai/threats/cve-2023-43770-roundcube-webmail-persistent-cross-site-scripting-xss  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-02-12. Updated: 2026-05-09  
License: CC BY 4.0 with a link back

CVE-2023-43770 · Severity: critical · CVSS 6.1 · Exploited in the wild · Published 2024-02-12

Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability in program/lib/Roundcube/rcube_string_replacer.php. The flaw allows attackers to execute malicious scripts via crafted links in plain/text email messages, potentially leading to information disclosure.

Technologies: [Roundcube Webmail](https://junglewise.ai/threats/technologies/webmail). Vendors: [Roundcube](https://junglewise.ai/threats/vendors/roundcube).

## Quick answers

**Is CVE-2023-43770 exploited in the wild?** Yes. CVE-2023-43770 is known to be exploited in the wild, first recorded on 12 February 2024. Treat it as urgent.

**How severe is CVE-2023-43770?** Critical severity, with a CVSS score of 6.1, published 12 February 2024.

**Which products and versions are affected?** Roundcube Webmail < 1.4.14, 1.5.x < 1.5.4, 1.6.x < 1.6.3.

**Is there a fix for CVE-2023-43770?** A patch was published on 2023-09-15: Vendor released security update 1.6.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2023-43770 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2023-43770?** Check whether you run Roundcube Webmail. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Roundcube Webmail < 1.4.14, 1.5.x < 1.5.4, 1.6.x < 1.6.3

## Timeline

- 2023-09-15: patched: Vendor released security update 1.6.3
- 2023-09-22: disclosed: NVD Published Date
- 2024-02-12: kev added: CISA added to Known Exploited Vulnerabilities Catalog

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- [Roundcube Webmail remote content blocking bypass in CSS FuncIRI handling](https://junglewise.ai/threats/cve-2026-114728-roundcube-webmail-before-1-6-20-and-1-7-x-before-1-7-5-is)