Vulnerability Details CVE-2026-114730
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”.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 31.5%
CVSS Severity
CVSS v3 Score 7.2
References
- https://bugs.debian.org/1151279
- https://github.com/roundcube/roundcubemail/commit/3c3a65f66b53b7aaf3d720acd06e0b102eceb090
- https://github.com/roundcube/roundcubemail/commit/6e1d480e730a45f29829b6a11af608d5d6eb3db6
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.20
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.5
- https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5
Products affected by CVE-2026-114730
-
cpe:2.3:a:roundcube:webmail:1.6.14
-
cpe:2.3:a:roundcube:webmail:1.6.15
-
cpe:2.3:a:roundcube:webmail:1.6.16
-
cpe:2.3:a:roundcube:webmail:1.6.17
-
cpe:2.3:a:roundcube:webmail:1.6.18
-
cpe:2.3:a:roundcube:webmail:1.6.19
-
cpe:2.3:a:roundcube:webmail:1.7.0
-
cpe:2.3:a:roundcube:webmail:1.7.1
-
cpe:2.3:a:roundcube:webmail:1.7.2
-
cpe:2.3:a:roundcube:webmail:1.7.3
-
cpe:2.3:a:roundcube:webmail:1.7.4