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CVE-2026-61907

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组织开源的一款支持IMAP协议的邮件服务器。 The Cyrus Team Cyrus IMAP 3.12.4之前版本存在授权问题漏洞，该漏洞源于JMAP snooze功能绕过目标邮箱的访问控制列表，可能导致已认证用户能够向其他用户的收件箱或已知ID的其他邮箱插入邮件，尽管这些用户对目标邮箱没有插入权限。

CVSS 4.3 · Medium EPSS 0.21% · P12

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 3

VendorProduct Version RangeStatus
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-2026-61907

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. JMAP snooze bypasses the destination-mailbox ACL. An authenticated user with insert permissions on another user's snoozed mailbox could cause insertion of mail to that user's inbox, or any other of their mailboxes whose id was known to the user, despite having no insert permissions to the target mailbox.
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
授权机制不正确
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组织开源的一款支持IMAP协议的邮件服务器。 The Cyrus Team Cyrus IMAP 3.12.4之前版本存在授权问题漏洞，该漏洞源于JMAP snooze功能绕过目标邮箱的访问控制列表，可能导致已认证用户能够向其他用户的收件箱或已知ID的其他邮箱插入邮件，尽管这些用户对目标邮箱没有插入权限。
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-2026-61907

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III. Intelligence Information for CVE-2026-61907

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Vendor Pages for CVE-2026-61907 (4)

Same Patch Batch · cyrusimap · 2026-09-09 · 6 CVEs total

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-2026-61909 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

IV. Related Vulnerabilities

Same product: Cyrus IMAP
Same vendor: cyrusimap
Same weakness: CWE-863