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CVE-2026-27856

CVSS 7.4 · High EPSS 0.39% · P32

Affected Version Matrix 1

VendorProductVersion RangeStatus
Open-Xchange GmbHOX Dovecot Pro≤ 2.3.0affected
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I. Basic Information for CVE-2026-27856

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Open-Xchange OX Dovecot Pro 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open-Xchange OX Dovecot Pro是德国Open-Xchange公司的一个邮件存储与投递系统。 Open-Xchange OX Dovecot Pro存在安全漏洞，该漏洞源于凭据验证使用直接比较，容易受到时序预言攻击，可能导致获取配置的凭据。
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
Open-Xchange GmbHOX Dovecot Pro 0 ~ 2.3.0 -

II. Public POCs for CVE-2026-27856

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III. Intelligence Information for CVE-2026-27856

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Same Patch Batch · Open-Xchange GmbH · 2026-03-27 · 11 CVEs total

CVE-2026-240317.7 HIGHOpen-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-278587.5 HIGHOpen-Xchange OX Dovecot Pro 安全漏洞
CVE-2025-590327.5 HIGHOpen-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-278556.8 MEDIUMOpen-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-03945.3 MEDIUMOpen-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-278595.3 MEDIUMOpen-Xchange OX Dovecot Pro 安全漏洞
CVE-2025-590285.3 MEDIUMOpen-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-278574.3 MEDIUMOpen-Xchange OX Dovecot Pro 安全漏洞
CVE-2025-590314.3 MEDIUMOpen-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-278603.7 LOWOpen-Xchange OX Dovecot Pro 安全漏洞

IV. Related Vulnerabilities

Same product: OX Dovecot Pro
Same vendor: Open-Xchange GmbH
Same weakness: CWE-287

V. Comments for CVE-2026-27856

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