# CVE-2026-114729: Roundcube Webmail content blocking bypass via SVG SMIL

Source: https://junglewise.ai/threats/cve-2026-114729-roundcube-webmail-before-1-6-20-and-1-7-x-before-1-7-5-is  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-22. Updated: 2026-10-22  
License: CC BY 4.0 with a link back

CVE-2026-114729 · Severity: medium · CVSS 5.3 · Published 2026-10-22

Roundcube Webmail is a web-based email client used by organizations and individual users to access their email accounts. A vulnerability in its content blocking filter allows malicious HTML emails to bypass protections and load remote content without user consent, potentially disclosing the recipient's IP address and confirming message opens. This can be exploited by sending a specially crafted email containing SVG animations.

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

## Quick answers

**Is CVE-2026-114729 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-114729 being exploited in the wild.

**How severe is CVE-2026-114729?** Medium severity, with a CVSS score of 5.3, published 22 October 2026.

**Which products and versions are affected?** Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5.

**Is there a fix for CVE-2026-114729?** Yes: fixed in Roundcube Webmail 1.6.20, 1.7.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-114729 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-114729?** Check whether you run Roundcube Webmail at an affected version. 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.

## How to fix

- Fixed in Roundcube Webmail 1.6.20, 1.7.5

## Technical details

The rcube_washtml HTML sanitizer inspects SVG SMIL animation attributes `to` and `from` for URIs but fails to check the `by` attribute, allowing an attacker to embed external content references. An unauthenticated attacker can send an HTML email with an SVG SMIL animation using the `by` attribute to trigger remote content loading, disclosing the client's IP and confirming message access.

## Affected products

- Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5

## Timeline

- 2026-10-22: disclosed: Published via NVD
- 2026-10-19: advisory: Upstream released version 1.6.20 with fix

## References

- [https://bugs.debian.org/1151279](https://bugs.debian.org/1151279)
- [https://github.com/roundcube/roundcubemail/commit/2b6ff79d8b14f94b0ff04765b7f02dbfdfe98efa](https://github.com/roundcube/roundcubemail/commit/2b6ff79d8b14f94b0ff04765b7f02dbfdfe98efa)

## 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 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)
- [Roundcube Webmail unsafe content passed to ImageMagick](https://junglewise.ai/threats/cve-2026-114727-roundcube-webmail-before-1-6-20-and-1-7-x-before-1-7-5-passes)