What’s Vulnerable › Vulnerabilities

CVE-2016-9920

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2016-12-08 · updated 2026-06-17
• Weakness: CWE-284

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.

Affected products

• Roundcube Webmail: through 1.1.6; 1.2.0, 1.2.1, 1.2.2

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
• 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

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