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CVE-2026-115785medium4.3

Zimbra Collaboration Suite Data Source Test SMTP Command Injection via Unsanitized Email Address

Impact

Zimbra Collaboration Suite versions 10.1.16 and 10.1.20 have an SMTP command injection vulnerability, allowing authenticated users to inject CR/LF into email addresses. This can submit mail with attacker-selected content. The weakness is due to improper neutralization of CRLF sequences.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

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Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Zimbra · rapid7

Zimbra Collaboration Suite

1 range
rapid7 version evidence

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affected

0 → through 10.1.20

semver versions

unaffected

unknown

Other versions: unaffected

Original source 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.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-115785

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Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-93 ↗

CWE-93 Improper neutralization of CRLF sequences ('CRLF injection')

rapid7

Related →
Contributing organizations · 2
rapid7

Assigning organization

2026-10-23
CISA-ADP

Additional data publisher

2026-10-29

What changed

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References

2 sources
wiki.zimbra.com/wiki/Zimbra_Security_Advisories
vendor-advisoryrapid7
www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/
relatedrapid7