Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability. rcmail_sendmail stripped newline characters only from the Subject and Organization headers, leaving other header values taken from request parameters unsanitized, so a remote authenticated attacker could inject arbitrary headers into an outgoing message via the References, In-Reply-To, Message-ID and From parameters. Upstream fixed this in the commit “Fix mail header injection via References/In-Reply-To/Message-ID/From parameters”, which normalizes whitespace in every string header value.
CVE-2026-114725
CVSS base score
5.0 (v3.1)
Severity
MEDIUM
Attack vector
Network
Weakness
CWE-99
Last modified
October 29, 2026
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
Affected products
roundcube webmail
References
- bugs.debian.org Third Party Advisory
- github.com Patch, Mailing List
- github.com Patch
- github.com Release Notes
- github.com Release Notes
- roundcube.net Issue Tracking