Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability. rcmail_sendmail::extract_inline_images() used the media type taken from an inline image data URI without validating it, so a remote authenticated attacker could inject arbitrary MIME part headers into the outgoing message by placing CRLF sequences in that media type. Upstream fixed this in the commit “Fix mail header injection via media type in an inline image data URI”, which validates the media type with rcube_mime::is_mimetype_valid().
CVE-2026-114716
CVSS base score
8.5 (v3.1)
Severity
HIGH
Attack vector
Network
Weakness
CWE-99
Last modified
October 30, 2026
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/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