CVE-2026-115785 — Zimbra Collaboration Suite Data Source Test SMTP Command Injection via Unsanitized Email Address
An SMTP command injection vulnerability in the data-source testing functionality of Zimbra Collaboration Suite (ZCS) allows an ordinary authenticated user with account options e…
Published: 2026-10-23 · CVSS: 4.3 · CVSS 3.1
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.
Source: CVE Program · Revision b3deaa7e6b91db76c3fd9a293f986425b1198aec