UpHeron
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Servers and applications

CVE-2016-9920

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
High 7.5
Published
8 Dec 2016
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
5.6% in the next 30 daysHigher than 93% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Improper access control (CWE-284)
Attack
Over the network · Only under certain conditions · Needs a user account · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Sources
NVD

Affected software

SoftwareAffected versions
RoundcubeServers and applications · cpe:a:roundcube:webmail
  • Every version up to 1.1.6
  • Version 1.2.0
  • Version 1.2.1
  • Version 1.2.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-9920
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-9920