---
title: "CVE-2026-109357: LibreNMS - Authentication Bypass"
description: "LibreNMS < 26.9.0 contains an LDAP injection caused by unescaped usernames in LDAP search filters in ldap-authorization and ad-authorization modes, letting unauthenticated attackers gain admin access via wildcard username, exploit requires REMOTE_USER not forwarded."
url: https://panop.io/threat-heartbeat/CVE-2026-109357/
---

# CVE-2026-109357 LibreNMS - Authentication Bypass

LibreNMS < 26.9.0 contains an LDAP injection caused by unescaped usernames in LDAP search filters in ldap-authorization and ad-authorization modes, letting unauthenticated attackers gain admin access via wildcard username, exploit requires REMOTE\_USER not forwarded.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.46% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-109357)

## Details

Type

Authentication Bypass

Impact

Broken Access Control

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

12 October 2026

Updated

15 October 2026

Weakness

[CWE-90](https://cwe.mitre.org/data/definitions/90.html)

## Vendor fix

Update to version 26.9.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-109357](https://nvd.nist.gov/vuln/detail/CVE-2026-109357)
- [https://github.com/librenms/librenms/security/advisories/GHSA-7cmx-65c5-8h8v](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://www.vulncheck.com/advisories/librenms-before-26.9.0-ldap-filter-injection-authentication-bypass-via-authorization-header)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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