CVE-2026-114725: Webmail 1.6.0 to before 1.6.20, 1.7.0 to before 1.7.5

Affected technology

Webmail · 1.6.0 to before 1.6.20, 1.7.0 to before 1.7.5
Roundcube

Description’s affected range: 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

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · Low privileges required · No user interaction required

What an attacker can do

The source says 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. Vendor/CNA’s CVSS 3.1 assessment (base score 5.0/10) rates confidentiality and availability impact as none; integrity impact as low.