CVE-2026-114725: 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…

PriorityP431medium5CVSS 3.1

AVNACLPRLUINSCCNILAN

EPSS

0.29%

20.0th percentile

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
roundcube	webmail	>= 1.6.0 < 1.6.20	1.6.20
roundcube	webmail	>= 1.7.0 < 1.7.5	1.7.5

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