CVE-2016-9920

7.5 highEPSS 5.6%

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.

Severity

CVSS 3.0

7.5 high

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 5.6% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-31)
CWE: CWE-284
Published: 2016-12-08
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

roundcube:webmail

References

http://www.openwall.com/lists/oss-security/2016/12/08/10
http://www.securityfocus.com/bid/94858
https://blog.ripstech.com/2016/roundcube-command-execution-via-email/
https://roundcube.net/news/2016/11/28/updates-1.2.3-and-1.1.7-released
https://security.gentoo.org/glsa/201612-44

Check your stack JSON