---
id: CVE-2026-114730
title: >-
  Roundcube Webmail 1.6.14 before 1.6.20 and 1.7.0 before 1.7.5 is affected by a
  server-side request forgery filter bypass
summary: >-
  Roundcube Webmail 1.6.14 before 1.6.20 and 1.7.0 before 1.7.5 is affected by a
  server-side request forgery filter bypass. The network blocklist used by
  rcube_utils::is_local_url() omitted the RFC 6052 NAT64 prefix 64:ff9b::/96,
  the RFC 8…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-918
vendor: Roundcube
product: Webmail
affected:
  - Webmail >= 1.6.14 < 1.6.20
  - Webmail >= 1.7.0 < 1.7.5
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T02:09:40.059Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114730'
references:
  - url: 'https://bugs.debian.org/1151279'
  - url: >-
      https://github.com/roundcube/roundcubemail/commit/6e1d480e730a45f29829b6a11af608d5d6eb3db6
  - url: 'https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5'
  - url: 'https://github.com/roundcube/roundcubemail/releases/tag/1.7.5'
  - url: 'https://github.com/roundcube/roundcubemail/releases/tag/1.6.20'
  - url: >-
      https://github.com/roundcube/roundcubemail/commit/3c3a65f66b53b7aaf3d720acd06e0b102eceb090
tags:
  - cve.org
ingestedAt: '2026-10-22T03:25:15.663Z'
---

## Overview

Roundcube Webmail 1.6.14 before 1.6.20 and 1.7.0 before 1.7.5 is affected by a server-side request forgery filter bypass. The network blocklist used by rcube_utils::is_local_url() omitted the RFC 6052 NAT64 prefix 64:ff9b::/96, the RFC 8215 local-use NAT64 prefix 64:ff9b:1::/48 and the unspecified address ::/128, so URLs such as http://[64:ff9b::7f00:1]/ passed the filter and reached loopback, link-local and cloud metadata addresses. Upstream fixed this in the commit “Fix SSRF filter (is_local_url()) bypass via NAT64 64:ff9b::/96”.

## Affected

- `Webmail >= 1.6.14 < 1.6.20`
- `Webmail >= 1.7.0 < 1.7.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.