CVE-2026-109357
LibreNMS before 26.9.0 LDAP Filter Injection Authentication Bypass via Authorization Header
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-90 |
| Vendor | librenms |
| Product | librenms |
| Published | Oct 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
librenms / librenms
0 < 26.9.0
References
Credits
🔍 offset