CVE-2026-27860
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I. Basic Information for CVE-2026-27860
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
LDAP查询中使用的特殊元素转义处理不恰当(LDAP注入)
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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 weakness: CWE-90
- CVE-2026-40606
ProxyAuth Addon LDAP Injection in mitmproxy - CVE-2026-40459
LDAP Injection in PAC4J - CVE-2026-40193
Maddy Mail Server: LDAP Filter Injection via Unsanitized Use - CVE-2026-0636
LDAP Injection Vulnerability in LDAPStoreHelper.java - CVE-2026-39962
LDAP injection in MISP ApacheAuthenticate when using a user-
V. Comments for CVE-2026-27860
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