Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability when a message is forwarded as an attachment. The subject of the forwarded message was used verbatim to generate the attachment name, so a received message whose subject contains CRLF sequences could inject arbitrary MIME part headers into the outgoing message. Upstream fixed this in the commit “Fix mail header injection via subject of a message forwarded as attachment”, which collapses whitespace in the generated name.
CVE-2026-114717
CVSS base score
4.0 (v3.1)
Severity
MEDIUM
Attack vector
Network
Weakness
CWE-99
Last modified
October 30, 2026
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Affected products
roundcube webmail
References
- bugs.debian.org Third Party Advisory, Mailing List
- github.com Patch
- github.com Patch
- github.com Release Notes
- github.com Release Notes
- roundcube.net Issue Tracking