CVE-2019-10740: Fedoraproject Fedora

Medium severity, CVSS 4.3. EPSS: 0.8% chance of exploitation in the next 30 days.

In Roundcube Webmail before 1.3.10, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, they unknowingly leak the plaintext of the encrypted message part(s) back to the attacker.

Affected products

• Fedoraproject Fedora: version 29 only
• Opensuse Backports Sle: version 15.0 only
• Opensuse Leap: version 15.1 only; version 15.2 only
• Roundcube Webmail: before 1.3.10 (fixed in 1.3.10)

Published 2019-04-07. Last modified 2026-06-17.