# CVE-2020-13965: Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

Source: https://junglewise.ai/threats/cve-2020-13965-roundcube-webmail-cross-site-scripting-xss-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-06-26. Updated: 2026-05-09  
License: CC BY 4.0 with a link back

CVE-2020-13965 · Severity: critical · CVSS 6.1 · Exploited in the wild · Published 2024-06-26

Roundcube Webmail contains a cross-site scripting (XSS) vulnerability when handling XML attachments. The application incorrectly allows text/xml files to be previewed, enabling remote attackers to execute malicious scripts in the context of the user's session via a specially crafted XML file.

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

## Quick answers

**Is CVE-2020-13965 exploited in the wild?** Yes. CVE-2020-13965 is known to be exploited in the wild, first recorded on 26 June 2024. Treat it as urgent.

**How severe is CVE-2020-13965?** Critical severity, with a CVSS score of 6.1, published 26 June 2024.

**Which products and versions are affected?** Roundcube Webmail before 1.3.12, 1.4.x before 1.4.5.

**Is there a fix for CVE-2020-13965?** A patch was published on 2020-06-02: Security updates 1.4.5 and 1.3.12 released by vendor. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2020-13965 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2020-13965?** 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 before 1.3.12, 1.4.x before 1.4.5

## Timeline

- 2020-06-02: patched: Security updates 1.4.5 and 1.3.12 released by vendor.
- 2024-06-26: kev added: Added to CISA Known Exploited Vulnerabilities Catalog.

## Related threats

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- [Roundcube Webmail uncontrolled resource consumption in CSS proxy](https://junglewise.ai/threats/cve-2026-114731-roundcube-webmail-before-1-6-20-and-1-7-x-before-1-7-5-is)
- [Roundcube Webmail server-side request forgery filter bypass](https://junglewise.ai/threats/cve-2026-114730-roundcube-webmail-1-6-14-before-1-6-20-and-1-7-0-before-1-7-5-is)
- [Roundcube Webmail content blocking bypass via SVG SMIL](https://junglewise.ai/threats/cve-2026-114729-roundcube-webmail-before-1-6-20-and-1-7-x-before-1-7-5-is)
- [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)