CVE-2026-115785 Zimbra Collaboration Suite Data Source Test SMTP Command Injection via Unsanitized Email Address
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-115785?
CVE-2026-115785 is a medium-severity vulnerability in Zimbra Collaboration Suite, published on 23 Oct 2026.
Official 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.
Weakness: CWE-93
Which versions are affected by CVE-2026-115785?
How do I fix CVE-2026-115785?
No fix has been published for CVE-2026-115785 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-115785 being exploited?
There is no known exploitation of CVE-2026-115785 in the wild and no public exploit code.
Sources
Also known as GHSA-m4x2-65hq-rqw6.