{"id":"CVE-2026-109357","title":"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","summary":"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 i…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-90"],"vendor":"librenms","product":"librenms","affected":["librenms < 26.9.0"],"published":"2026-10-12","updated":"2026-10-15","sourceUpdated":"2026-10-15T20:33:06.527","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109357","references":[{"url":"https://github.com/librenms/librenms/security/advisories/GHSA-7cmx-65c5-8h8v","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/librenms-before-26.9.0-ldap-filter-injection-authentication-bypass-via-authorization-header","label":"disclosure@vulncheck.com"},{"url":"https://github.com/librenms/librenms/security/advisories/GHSA-7cmx-65c5-8h8v","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00596,"epssPercentile":0.48271,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T02:52:45.546482Z"},"ingestedAt":"2026-10-12T18:00:08.213Z","slug":"CVE-2026-109357","body":"## Overview\n\nLibreNMS 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":57,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":222042,"id":"CVE-2026-109357","ts":1792043623570,"field":"exploit_available","old":"false","new":"true"}]}