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CVE-2026-109357— LibreNMS before 26.9.0 LDAP Filter Injection Authentication Bypass via Authorization Header

Quick assessment

Affected
librenms librenms
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.

LibreNMS 在版本 26.9.0 之前存在 LDAP 过滤注入漏洞，出现在 ldap-authorization 和 ad-authorization 模式下。该漏洞的成因是用户名以未转义的方式直接插入到 LDAP 搜索过滤器中，并且认证过程仅检查用户是否存在。当未转发 REMOTE_USER 变量时，未认证的攻击者可通过 HTTP Basic 认证（PHP_AUTH_USER）发送通配符用户名，从而匹配所有用户和组，获取管理员权限。

CVSS 8.1 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
librenms librenms < 26.9.0 affected
26.9.0 unaffected
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I. Basic Information for CVE-2026-109357

Vulnerability Information
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Vulnerability Title
LibreNMS before 26.9.0 LDAP Filter Injection Authentication Bypass via Authorization Header
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS before 26.9.0 contains an LDAP filter injection in ldap-authorization and ad-authorization modes because usernames are inserted unescaped into LDAP search filters and authentication only checks user existence. When REMOTE_USER is not forwarded, unauthenticated attackers can send a wildcard username via HTTP Basic Authorization (PHP_AUTH_USER) to match all users and groups and gain admin access.
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:H
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
librenms librenms 0 ~ 26.9.0 -

II. Public POCs for CVE-2026-109357

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III. Intelligence Information for CVE-2026-109357

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Vendor Advisories for CVE-2026-109357 (1)

News Coverage for CVE-2026-109357 (1)

Same Patch Batch · librenms · 2026-10-12 · 6 CVEs total

CVE-2026-109353 7.1 HIGH LibreNMS before 26.9.0 SQL Injection via notification_id in notifications.inc.php
CVE-2026-109355 6.1 MEDIUM LibreNMS before 26.9.0 Stored XSS via Tools Oxidized Node List
CVE-2026-109352 6.1 MEDIUM LibreNMS before 26.9.0 Stored XSS via wireless sensor description
CVE-2026-109356 4.3 MEDIUM LibreNMS before 26.9.0 Missing Authorization in Port Purge via PortsController
CVE-2026-109354 4.3 MEDIUM LibreNMS before 26.9.0 Path Traversal via NFSen channel Parameter

IV. Related Vulnerabilities

Same product: librenms
Same vendor: librenms
Same weakness: CWE-90

V. Comments for CVE-2026-109357

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