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CVE-2026-109357

LibreNMS vulnerability

8.1 HIGH
  1. Published12 Oct 2026

Description

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 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-940539.1
Authentication bypass via LDAP injection in component sshd-ldap in Apache MINA SSHD…
CVE-2026-750208.1
Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')…
CVE-2026-582228.8
A security flaw combining LDAP filter injection and improper authorization checks was…
CVE-2026-473038.8
Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized…
CVE-2026-42568.2
Improper neutralization of special elements used in an LDAP query ('LDAP injection')…
CVE-2026-136968.8
Improper neutralization of special elements used in an LDAP query ('LDAP injection')…

Frequently asked

Is CVE-2026-109357 being actively exploited?

CVE-2026-109357 is not in the CISA KEV catalog.

How severe is CVE-2026-109357?

CVE-2026-109357 has a CVSS 3.1 base score of 8.1, rated high.

How do I fix CVE-2026-109357?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-109357 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.