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CVE-2026-27860

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auth_username_chars为空时可能注入任意LDAP过滤器，可能导致绕过限制。

CVSS 3.7 · Low EPSS 0.34% · P25
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I. Basic Information for CVE-2026-27860

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or 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:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
LDAP查询中使用的特殊元素转义处理不恰当(LDAP注入)
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auth_username_chars为空时可能注入任意LDAP过滤器，可能导致绕过限制。
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 ~ 3.1.0 -

II. Public POCs for CVE-2026-27860

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III. Intelligence Information for CVE-2026-27860

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

CVE-2026-24031 7.7 HIGH Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-27858 7.5 HIGH Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2025-59032 7.5 HIGH Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-27856 7.4 HIGH Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-27855 6.8 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-0394 5.3 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-27859 5.3 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2025-59028 5.3 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-27857 4.3 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2025-59031 4.3 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞

IV. Related Vulnerabilities

Same product: OX Dovecot Pro
Same vendor: Open-Xchange GmbH
Same weakness: CWE-90

V. Comments for CVE-2026-27860

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