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CVE-2026-27851

Quick assessment

Affected
Open-Xchange GmbH OX Dovecot Pro
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.

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，该漏洞源于使用安全过滤器进行变量扩展时，同一字符串上的所有后续管道被错误地视为安全，导致不安全数据被取消转义，可能在身份验证中启用SQL或LDAP注入攻击。

CVSS 7.4 · High EPSS 0.57% · P46

Affected Version Matrix 2

VendorProduct Version RangeStatus
Open-Xchange GmbH OX Dovecot Pro ≤ 3.1.4 affected
≤ 2.4.3 affected
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I. Basic Information for CVE-2026-27851

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using safe filter until on 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
对额外参数处理不恰当
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，该漏洞源于使用安全过滤器进行变量扩展时，同一字符串上的所有后续管道被错误地视为安全，导致不安全数据被取消转义，可能在身份验证中启用SQL或LDAP注入攻击。
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
Open-Xchange GmbH OX Dovecot Pro 0 ~ 3.1.4 -

II. Public POCs for CVE-2026-27851

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III. Intelligence Information for CVE-2026-27851

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Vendor Advisories for CVE-2026-27851 (1)

Same Patch Batch · Open-Xchange GmbH · 2026-05-12 · 5 CVEs total

CVE-2026-33603 6.8 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-40016 5.3 MEDIUM Open-Xchange OX Dovecot Pro 资源管理错误漏洞
CVE-2026-42006 4.3 MEDIUM Open-Xchange OX Dovecot Pro 资源管理错误漏洞
CVE-2026-40020 3.1 LOW Open-Xchange OX Dovecot Pro 访问控制错误漏洞

IV. Related Vulnerabilities

Same product: OX Dovecot Pro
Same vendor: Open-Xchange GmbH
Same weakness: CWE-235

V. Comments for CVE-2026-27851

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