# CVE-2026-114722: Roundcube Webmail CSS scoping bypass in HTML messages

Source: https://junglewise.ai/threats/cve-2026-114722-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-2026-114722 · Severity: medium · CVSS 6.5 · Published 2026-10-22

Roundcube Webmail is an email client that runs in a web browser. A malicious HTML email can bypass CSS security boundaries and restyle the application interface itself, enabling attackers to spoof login forms or other application elements to trick users into revealing credentials or sensitive information.

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

## Quick answers

**Is CVE-2026-114722 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-114722 being exploited in the wild.

**How severe is CVE-2026-114722?** Medium severity, with a CVSS score of 6.5, 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-2026-114722?** Yes: fixed in 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-2026-114722 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-114722?** 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 1.6.20, 1.7.5

## Technical details

The rcube_utils::mod_css_styles() function failed to treat CSS at-rule prologues (e.g., @layer a;) as selector boundaries and did not handle selectors beginning with ::, allowing CSS rules in HTML messages to escape their intended scope and apply to the entire Roundcube interface. An attacker can craft an HTML email that resizes application chrome for UI redressing attacks without requiring user interaction beyond opening the email.

## Affected products

- Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5

## Timeline

- 2026-10-22: disclosed
- 2026-10-19: patched

## References

- [https://bugs.debian.org/1151279](https://bugs.debian.org/1151279)
- [https://github.com/roundcube/roundcubemail/commit/95b81ae12e2819a9b7e8636b5859b6244cda383e](https://github.com/roundcube/roundcubemail/commit/95b81ae12e2819a9b7e8636b5859b6244cda383e)

## Related threats

- [Roundcube Webmail improper authentication in multi-host installations](https://junglewise.ai/threats/cve-2026-114732-roundcube-webmail-before-1-6-20-and-1-7-x-before-1-7-5-is)
- [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)