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CVE-2026-47086

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.

cyrusimap Cyrus IMAP是cyrusimap团队开源的一款支持IMAP协议的邮件服务器。 cyrusimap Cyrus IMAP 3.12.2及之前版本存在授权问题漏洞，该漏洞源于GENURLAUTH颁发的令牌可能绕过ACL，任何已认证的用户都可以为任何能够命名的邮箱生成URLAUTH令牌，即使没有读取权限，也能读取邮箱中的邮件。

CVSS 3.5 · Low EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
cyrusimap Cyrus IMAP < 3.12.3 affected
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I. Basic Information for CVE-2026-47086

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. GENURLAUTH-issued tokens can bypass ACLs. Any authenticated user could mint a URLAUTH token (via the GENURLAUTH command) for any mailbox they could name, even without read access on it. This would allow reading mail from mailboxes despite having no granted permissions.
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
cyrusimap Cyrus IMAP 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cyrusimap Cyrus IMAP是cyrusimap团队开源的一款支持IMAP协议的邮件服务器。 cyrusimap Cyrus IMAP 3.12.2及之前版本存在授权问题漏洞，该漏洞源于GENURLAUTH颁发的令牌可能绕过ACL，任何已认证的用户都可以为任何能够命名的邮箱生成URLAUTH令牌，即使没有读取权限，也能读取邮箱中的邮件。
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 ~ 3.12.3 -

II. Public POCs for CVE-2026-47086

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III. Intelligence Information for CVE-2026-47086

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Vendor Pages for CVE-2026-47086 (2)

Same Patch Batch · cyrusimap · 2026-07-16 · 9 CVEs total

CVE-2026-47084 6.5 MEDIUM cyrusimap Cyrus IMAP 授权问题漏洞
CVE-2026-47082 5.4 MEDIUM cyrusimap Cyrus IMAP 授权问题漏洞
CVE-2026-47083 4.3 MEDIUM cyrusimap Cyrus IMAP 侧信道信息泄露漏洞
CVE-2026-47089 4.3 MEDIUM cyrusimap Cyrus IMAP 授权问题漏洞
CVE-2026-47085 4.0 MEDIUM cyrusimap Cyrus IMAP 加密问题漏洞
CVE-2026-47087 3.5 LOW cyrusimap Cyrus IMAP 资源管理错误漏洞
CVE-2026-47081 3.1 LOW cyrusimap Cyrus IMAP 授权问题漏洞
CVE-2026-47088 3.1 LOW cyrusimap Cyrus IMAP 缓冲区错误漏洞

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-47086

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