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CVE-2026-47085

CVSS 4.0 · Medium EPSS 0.20% · P10

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
cyrusimapCyrus IMAP< 3.12.3affected
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I. Basic Information for CVE-2026-47085

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. URLAUTH token forgery can occur via a missing mboxkey. If an attacker knew a folder name on the victim's account for which the victim had never issued an auth URL, they could forge a working URLAUTH token by computing an HMAC-SHA1 value with a predictable key, giving them read access to the mailbox. (URLAUTH is an obscure feature, meaning that the odds of any user actually being susceptible to this attack are very low. Perhaps no public clients use URLAUTH.)
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
可预测问题
Source: CVE Program / CVE List V5
Vulnerability Title
cyrusimap Cyrus IMAP 加密问题漏洞
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及之前版本存在加密问题漏洞，该漏洞源于缺失mboxkey导致URLAUTH令牌伪造，攻击者可能通过预测HMAC-SHA1值伪造令牌，读取收件箱。
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

VendorProductAffected VersionsCPESubscribe
cyrusimapCyrus IMAP 0 ~ 3.12.3 -

II. Public POCs for CVE-2026-47085

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III. Intelligence Information for CVE-2026-47085

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Vendor Pages for CVE-2026-47085 (2)

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

CVE-2026-470846.5 MEDIUMcyrusimap Cyrus IMAP 授权问题漏洞
CVE-2026-470825.4 MEDIUMcyrusimap Cyrus IMAP 授权问题漏洞
CVE-2026-470834.3 MEDIUMcyrusimap Cyrus IMAP 侧信道信息泄露漏洞
CVE-2026-470894.3 MEDIUMcyrusimap Cyrus IMAP 授权问题漏洞
CVE-2026-470863.5 LOWcyrusimap Cyrus IMAP 授权问题漏洞
CVE-2026-470873.5 LOWcyrusimap Cyrus IMAP 资源管理错误漏洞
CVE-2026-470813.1 LOWcyrusimap Cyrus IMAP 授权问题漏洞
CVE-2026-470883.1 LOWcyrusimap Cyrus IMAP 缓冲区错误漏洞

IV. Related Vulnerabilities

Same product: Cyrus IMAP
Same vendor: cyrusimap
Same weakness: CWE-340

V. Comments for CVE-2026-47085

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