CVE-2026-61909
Quick assessment
Affected
cyrusimap Cyrus IMAP
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.
The Cyrus Team Cyrus IMAP是The Cyrus Team组织开源的一款面向企业应用的邮件服务器软件。 The Cyrus Team Cyrus IMAP 3.8.8之前版本、3.9.0至3.10.4之前版本和3.11.0至3.12.4之前版本存在授权问题漏洞，该漏洞源于CalDAV/CardDAV multiget绕过每个href的ACL，可能导致拥有部分共享访问权限的已认证DAV用户通过构造包含目标href的calendar-multiget或addressbook-multig
Possible ATT&CK Techniques 1 AI
T1577Affected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| cyrusimap | Cyrus IMAP | < 3.8.8 |
affected |
3.9.0< 3.10.4 |
affected | ||
3.11.0< 3.12.4 |
affected |
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I. Basic Information for CVE-2026-61909
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in Cyrus IMAP before 3.12.4. CalDAV/CardDAV multiget bypasses a per-href ACL. An authenticated DAV user with some shared access to another user's calendar or address book could read even unshared events or contacts by including the target hrefs in a calendar-multiget or addressbook-multiget REPORT.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未保护的候选通道
Source: CVE Program / CVE List V5
Vulnerability Title
The Cyrus Team Cyrus IMAP 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
The Cyrus Team Cyrus IMAP是The Cyrus Team组织开源的一款面向企业应用的邮件服务器软件。 The Cyrus Team Cyrus IMAP 3.8.8之前版本、3.9.0至3.10.4之前版本和3.11.0至3.12.4之前版本存在授权问题漏洞，该漏洞源于CalDAV/CardDAV multiget绕过每个href的ACL，可能导致拥有部分共享访问权限的已认证DAV用户通过构造包含目标href的calendar-multiget或addressbook-multig
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| cyrusimap | Cyrus IMAP | 0 ~ 3.8.8 | - |
|
II. Public POCs for CVE-2026-61909
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Vendor Pages for CVE-2026-61909 (4)
Same Patch Batch · cyrusimap · 2026-09-09 · 6 CVEs total
| CVE-2026-61907 | 4.3 MEDIUM | The Cyrus Team Cyrus IMAP 授权问题漏洞 |
| CVE-2026-61911 | 4.3 MEDIUM | The Cyrus Team Cyrus IMAP 信息泄露漏洞 |
| CVE-2026-61915 | 4.2 MEDIUM | The Cyrus Team Cyrus IMAP 资源管理错误漏洞 |
| CVE-2026-61910 | 3.5 LOW | The Cyrus Team Cyrus IMAP 授权问题漏洞 |
| CVE-2026-61908 | 3.1 LOW | The Cyrus Team Cyrus IMAP 缓冲区错误漏洞 |