CVE-2026-109357

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.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/librenms/librenms/security/advisories/GHSA-7cmx-65c5-8h8v
https://www.vulncheck.com/advisories/librenms-before-26.9.0-ldap-filter-injection-authentication-bypass-via-authorization-header
https://github.com/librenms/librenms/security/advisories/GHSA-7cmx-65c5-8h8v

Configurations

No configuration.

History

15 Oct 2026, 03:17

Type	Values Removed	Values Added
References	~~() https://github.com/librenms/librenms/security/advisories/GHSA-7cmx-65c5-8h8v -~~	() https://github.com/librenms/librenms/security/advisories/GHSA-7cmx-65c5-8h8v -

12 Oct 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-12 17:17

Updated : 2026-10-15 20:33

NVD link : CVE-2026-109357

Mitre link : CVE-2026-109357

CVE.ORG link : CVE-2026-109357

JSON object : View

Products Affected

No product.

CWE

CWE-90

Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

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