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

Quick assessment

Affected

Zimbra Zimbra Collaboration Suite

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zimbra Collaboration Suite (ZCS) 的数据源测试功能中存在一个 SMTP 命令注入漏洞。若普通已认证用户启用了账户选项，则可通过 JSON SOAP 请求，在插入到 SMTP 信封命令中的电子邮件地址里注入回车/换行符（CR/LF）。在完成初步的 POP3 或 IMAP 登录后，Zimbra 会将注入的命令发送至所选的 SMTP 服务。若该服务接受流水线式事务处理，攻击者便可在无需受害者参与的情况下，提交由攻击者指定收件人、邮件头及正文内容的邮件。该漏洞存在于 ZCS 10.1.16

CVSS 4.3 · Medium Updated Oct 23, 2026

Possible ATT&CK Techniques 2 AI

T1566 · Phishing T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

对CRLF序列的转义处理不恰当(CRLF注入)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Zimbra	Zimbra Collaboration Suite	0 ~ 10.1.20	-

II. Public POCs for CVE-2026-115785

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-115785

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Vendor Advisories for CVE-2026-115785 (1)

Zimbra Security Advisories - Zimbra :: Tech Center vendor-advisory

Other References for CVE-2026-115785 (1)

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

https://www.cve.org/CVERecord?id=CVE-2026-115785

Same Patch Batch · Zimbra · 2026-10-23 · 17 CVEs total

CVE-2026-10632	8.7 HIGH	Zimbra Collaboration Suite Classic Web Client Reflected Cross-Site Scripting via Document
CVE-2026-50053	8.7 HIGH	Zimbra Collaboration Suite RestFilter Request Attribute Override via Unauthenticated URL P
CVE-2026-93639	8.7 HIGH	Zimbra Collaboration Suite Missing Authorization in ConfigureZimlet Enables Delegated Admi
CVE-2026-93640	7.8 HIGH	Zimbra Collaboration Suite Local Privilege Escalation via Unrestricted zmunbound Sudo Conf
CVE-2026-50056	7.8 HIGH	Zimbra Collaboration Suite Local Privilege Escalation via zmmailboxdmgr JVM Argument Injec
CVE-2026-50057	7.8 HIGH	Zimbra Collaboration Suite Local Privilege Escalation via Unrestricted Postfix Sudo Permis
CVE-2026-93631	7.1 HIGH	Zimbra Collaboration Suite OAuth Extension Cross-Site Request Forgery Enables Account Link
CVE-2026-115786	6.5 MEDIUM	Zimbra Collaboration Suite Shared-File Mailbox Quota Accounting Error Enables Quota Exhaus
CVE-2026-93638	6.1 MEDIUM	Zimbra Collaboration Suite Pre-Authentication Reflected Cross-Site Scripting via Login Pag
CVE-2026-93633	5.4 MEDIUM	Zimbra Collaboration Suite Briefcase CSS Sanitization Bypass via Non-ASCII Stylesheet Char
CVE-2026-93629	5.3 MEDIUM	Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar
CVE-2026-93627	5.3 MEDIUM	Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar
CVE-2026-93628	5.3 MEDIUM	Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar
CVE-2026-93630	4.3 MEDIUM	Zimbra Collaboration Suite Email HTML Sanitizer Bypass via Hostname Canonicalization
CVE-2026-93634	4.3 MEDIUM	Zimbra Collaboration Suite Cross-Account Authorization Bypass via Forged Shared-File Recor
CVE-2026-93636	4.3 MEDIUM	Zimbra Collaboration Suite LDAP Filter Injection via Calendar Resource Attribute Name

IV. Related Vulnerabilities

Same product: Zimbra Collaboration Suite

Same vendor: Zimbra

Same weakness: CWE-93

V. Comments for CVE-2026-115785

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Goal Reached Thanks to every supporter — we hit 100%!

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

Quick assessment

Possible ATT&CK Techniques 2 AI

I. Basic Information for CVE-2026-115785

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-115785

III. Intelligence Information for CVE-2026-115785

Vendor Advisories for CVE-2026-115785 (1)

Other References for CVE-2026-115785 (1)

Same Patch Batch · Zimbra · 2026-10-23 · 17 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-115785

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