CVE-2026-113386: 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 are affected by IMAP command injection

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

A remote authenticated attacker can exploit this via CRLF sequences injected into the _uid parameter of the mail/headers and mail/viewsource actions to execute arbitrary IMAP commands. Vendor/CNA’s CVSS 3.1 assessment (base score 7.1/10) rates confidentiality impact as low; integrity impact as high; availability impact as none.