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    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.

    Published:Oct 12, 2026
    Last Modified:Oct 15, 2026
    EPS:Oct 12, 2026
    EPSS Score:0.00458
    CVSS Score:8.1

    Affected Products

    Vendor
    Librenms
    Product
    Librenms

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-136 LDAP Injection

    Related CVEs

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    CVE-2026-109354 (CVSS 5.3) — LibreNMS before 26.9.0 contains a path traversal vulnerability in nfsen_channel_common.inc.php that allows aut…
    CVE-2026-109353 (CVSS 7.1) — LibreNMS before 26.9.0 contains an SQL injection vulnerability that allows unprivileged users to inject SQL by…
    CVE-2026-109352 (CVSS 5.3) — LibreNMS before 26.9.0 contains a stored cross-site scripting vulnerability in includes/html/pages/device/wire…
    CVE-2026-108715 (CVSS 5.3) — LibreNMS through 26.9.1.1 contains an authorization bypass vulnerability in includes/html/graphs/smokeping/aut…
    CVE-2020-15875 (CVSS 5) — An issue was discovered in LibreNMS 1.65. A remote authenticated attacker with normal privileges can extract a…
    CVE-2026-86427 (CVSS 8.7) — LibreNMS before 26.8.0 contains an argument injection vulnerability in the graph_title parameter that allows a…
    CVE-2026-86426 (CVSS 9.2) — LibreNMS before 26.8.0 contains an authentication bypass vulnerability in the REST API that allows unauthentic…
    CVE-2026-84194 (CVSS 8.6) — LibreNMS versions >= 23.10.0 and < 26.2.0 (fixed in 26.4.0) contain an authenticated OS command injection vuln…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High