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CVE-2026-61910

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Mailbox/set访问控制不当，具有maySetKeywords权限的已认证用户可更改其他用户邮箱的特殊用途注释，可能导致共享用户更改共享邮箱的特殊用途角色，使邮件被写入共享邮箱并共享超出预期内容。

CVSS 3.5 · Low EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1531 · Account Access Removal

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-2026-61910

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. Mailbox/set let a sharee change a special-use role on shared mailboxes. An authenticated user with maySetKeywords on another user's mailbox could change that mailbox's specialuse annotation. This could allow the sharee to change the shared mailbox to perform the archived, snoozed, or other role, which might cause mail mail to be written to the shared mailbox, sharing more content than intended. (This is likely to be an unusual situation, made more unusual because if the target already has an non-shared mailbox with that role, role duplication suppression will prevent the update.)
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
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Mailbox/set访问控制不当，具有maySetKeywords权限的已认证用户可更改其他用户邮箱的特殊用途注释，可能导致共享用户更改共享邮箱的特殊用途角色，使邮件被写入共享邮箱并共享超出预期内容。
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-2026-61910

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III. Intelligence Information for CVE-2026-61910

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Vendor Pages for CVE-2026-61910 (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-2026-61909 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