CVE-2026-114726
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability in the Bounce (resend) action. rcube_mime::decode_address_list() did not strip control chara
Roundcube WebmailApplications & CMS
CVSS
5.8MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.33%Chance of exploitation activity in the next 30 days, higher than 24% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability in the Bounce (resend) action. rcube_mime::decode_address_list() did not strip control characters from the decoded display name, so a received message whose From display-name carries CRLF sequences in an encoded word could inject arbitrary headers into the message emitted when the user bounces it. Upstream fixed this in the commit “Fix mail header injection via the From display-name in the Bounce (resend) action”.
Text from CVE List
Affected versions 2
- Webmailaffected: 1.6.0 before 1.6.20CVE List
- Webmailaffected: 1.7.0 before 1.7.5CVE List
References 6
- github.com/roundcube/roundcubemail/commit/d3a35545fdaf72b02a9a4d670064895488e9d9d0Fixvia CVE List
- github.com/roundcube/roundcubemail/releases/tag/1.7.5Fixvia CVE List
- github.com/roundcube/roundcubemail/releases/tag/1.6.20Fixvia CVE List
- github.com/roundcube/roundcubemail/commit/3a136465c965776a5f636587187626985dae4f3bFixvia CVE List
- bugs.debian.org/1151279Advisoryvia CVE List
- roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5Advisoryvia CVE List