# CVE-2026-114730: Roundcube Webmail server-side request forgery filter bypass

Source: 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  
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-2026-114730 · Severity: high · CVSS 7.2 · Published 2026-10-22

Roundcube Webmail is a web-based email client used by organizations to access corporate mail. A flaw in its security filter allows attackers to bypass protections and access sensitive internal services like cloud metadata endpoints, potentially leading to credential theft or information disclosure.

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

## Quick answers

**Is CVE-2026-114730 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-114730 being exploited in the wild.

**How severe is CVE-2026-114730?** High severity, with a CVSS score of 7.2, published 22 October 2026.

**Which products and versions are affected?** Roundcube Webmail 1.6.14 before 1.6.20, 1.7.0 before 1.7.5.

**Is there a fix for CVE-2026-114730?** 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-2026-114730 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-114730?** 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 is_local_url() function in rcube_utils omitted RFC 6052 and RFC 8215 NAT64 address ranges (64:ff9b::/96, 64:ff9b:1::/48) and the IPv6 unspecified address ::/128 from its blocklist, allowing crafted IPv6 URLs like http://[64:ff9b::7f00:1]/ to reach loopback and cloud metadata addresses. An attacker can craft specially-formatted URLs in email content or application input to bypass SSRF protections with no authentication required.

## Affected products

- Roundcube Webmail 1.6.14 before 1.6.20, 1.7.0 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/3c3a65f66b53b7aaf3d720acd06e0b102eceb090](https://github.com/roundcube/roundcubemail/commit/3c3a65f66b53b7aaf3d720acd06e0b102eceb090)

## 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 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)