CVE-2026-114716: 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::extract_inline_images() used the media type taken from an inline image data URI without validating it

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

So a remote authenticated attacker could inject arbitrary MIME part headers into the outgoing message by placing CRLF sequences in that media type. Vendor/CNA’s CVSS 3.1 assessment (base score 8.5/10) rates confidentiality impact as low; integrity impact as high; availability impact as none.