CVE-2026-114730

roundcubemail: roundcubemail: Server-Side Request Forgery via address filter bypass

Published Oct 22, 2026 CVSS 3.1 · 7.2 High EPSS < 1% KEV · Not listed
Description
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”.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-6579-1 roundcube security update
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title SSRF Bypass in Roundcube Webmail Allows Internal Network Access roundcubemail: roundcubemail: Server-Side Request Forgery via address filter bypass
References
Metrics threat_severity

None

threat_severity

Important

Type Values Removed Values Added
Title SSRF Bypass in Roundcube Webmail Allows Internal Network Access
Type Values Removed Values Added
Description 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”.
First Time appeared Roundcube
Roundcube webmail
Weaknesses CWE-918
CPEs cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
Vendors & Products Roundcube
Roundcube webmail
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Oct 28, 2026, 2:18 AM
Reserved
Oct 22, 2026, 2:09 AM
Status
Analyzed
Published
Oct 22, 2026, 3:16 AM
Modified
Nov 4, 2026, 1:49 AM
Severity
Important
Public date
Oct 22, 2026, 2:09 AM