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CVE-2026-34578— OPNsense has an LDAP Injection via Unsanitized Username in Authentication

Quick assessment

Affected
opnsense core
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Deciso OPNsense是荷兰Deciso公司的一套基于FreeBSD的开源防火墙和路由软件。 OPNsense 26.1.6之前版本存在安全漏洞，该漏洞源于LDAP身份验证连接器直接将登录用户名传递到LDAP搜索过滤器而未调用ldap_escape，可能导致未经身份验证的攻击者向WebGUI登录页面的用户名字段注入LDAP过滤器元字符，以枚举配置目录中的有效LDAP用户名，或在配置包含扩展查询以限制登录特定组成员时，绕过该组成员资格限制。

CVSS 8.2 · High EPSS 0.48% · P39
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I. Basic Information for CVE-2026-34578

Vulnerability Information
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Vulnerability Title
OPNsense has an LDAP Injection via Unsanitized Username in Authentication
Source: CVE Program / CVE List V5
Vulnerability Description
OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.6, OPNsense's LDAP authentication connector passes the login username directly into an LDAP search filter without calling ldap_escape(). An unauthenticated attacker can inject LDAP filter metacharacters into the username field of the WebGUI login page to enumerate valid LDAP usernames in the configured directory. When the LDAP server configuration includes an Extended Query to restrict login to members of a specific group, the same injection can be used to bypass that group membership restriction and authenticate as any LDAP user whose password is known, regardless of group membership. This vulnerability is fixed in 26.1.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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
Deciso OPNsense 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Deciso OPNsense是荷兰Deciso公司的一套基于FreeBSD的开源防火墙和路由软件。 OPNsense 26.1.6之前版本存在安全漏洞，该漏洞源于LDAP身份验证连接器直接将登录用户名传递到LDAP搜索过滤器而未调用ldap_escape，可能导致未经身份验证的攻击者向WebGUI登录页面的用户名字段注入LDAP过滤器元字符，以枚举配置目录中的有效LDAP用户名，或在配置包含扩展查询以限制登录特定组成员时，绕过该组成员资格限制。
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
opnsense core < 26.1.6 -

II. Public POCs for CVE-2026-34578

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 11167 chars
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III. Intelligence Information for CVE-2026-34578

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Patches & Fixes for CVE-2026-34578 (1)

Vendor Advisories for CVE-2026-34578 (1)

IV. Related Vulnerabilities

Same product: core
Same vendor: opnsense
Same weakness: CWE-90

V. Comments for CVE-2026-34578

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