CVE-2026-109357
LibreNMS before 26.9.0 LDAP Filter Injection Authentication Bypass via Authorization Header
Published Oct 12, 2026 · updated Oct 15, 2026 · librenms librenms
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.
Code
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Timeline
Detection, updates, and resolution for this record.
Oct 12, 2026 · NIST NVD
Detected
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 a
Oct 15, 2026 · NIST NVD
Updated
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 a
Affected
- vendor librenms librenmsversion unspecified
Sources
- CIRCL Vulnerability LookupVulnerability recordCVE-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
vulnerability.circl.lu - CVE.orgVulnerability recordCVE-2026-109357
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-109357
30-day exploitation probability 0.5%
first.org - NIST NVDVulnerability recordCVE-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
nvd.nist.gov