CVE-2016-9920

PoC —

CVSS 3.0

7.5 high

EPSS

6%p92

Published

Dec 8, 2016 (Dec 8, 2016)

Modified

Jun 17, 2026

Description

steps/mail/sendmail.inc in Roundcube before 1.1.7 and 1.2.x before 1.2.3, when no SMTP server is configured and the sendmail program is enabled, does not properly restrict the use of custom envelope-from addresses on the sendmail command line, which allows remote authenticated users to execute arbitrary code via a modified HTTP request that sends a crafted e-mail message.

Vendors: roundcube
Products: webmail
Weakness: CWE-284
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (5.6%)

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