# CVE-2026-114732: Roundcube Webmail improper authentication in multi-host installations

Source: https://junglewise.ai/threats/cve-2026-114732-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-2026-114732 · Severity: medium · CVSS 6.8 · Published 2026-10-22

Roundcube Webmail is an email client that runs in web browsers and connects to IMAP mail servers. In multi-host setups where one instance serves multiple IMAP servers, an attacker can log in using an alias email address associated with a user on one server and gain access to the account of a different user on another server. This allows unauthorized access to another user's email.

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

## Quick answers

**Is CVE-2026-114732 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-114732 being exploited in the wild.

**How severe is CVE-2026-114732?** Medium severity, with a CVSS score of 6.8, published 22 October 2026.

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

**Is there a fix for CVE-2026-114732?** 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-2026-114732 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-114732?** 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_user::query() function performs alias lookups against identity records without verifying the IMAP host, causing cross-host account confusion in multi-host Roundcube installations. An attacker can exploit this by logging in with an alias email address belonging to a user on a different IMAP host to hijack that user's account. A fix is available in versions 1.6.20 and 1.7.5.

## Affected products

- Roundcube Webmail before 1.6.20; 1.7.x before 1.7.5

## Timeline

- 2026-10-22: disclosed
- 2026-10-19: patched: Version 1.6.20 and 1.7.5 released

## References

- [https://bugs.debian.org/1151279](https://bugs.debian.org/1151279)
- [https://github.com/roundcube/roundcubemail/commit/453c413d6851cf603bebdb15e58381f5ef9b8094](https://github.com/roundcube/roundcubemail/commit/453c413d6851cf603bebdb15e58381f5ef9b8094)

## Related threats

- [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)
- [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)