What is CVE-2026-109357?

CVE-2026-109357 is a high-severity vulnerability in Librenms, classified under LDAP Injection. CVSS score: 8.1/10. Published 2026-10-12.

How severe is CVE-2026-109357?

High severity. CVSS v3 base score is 8.1 out of 10.

LDAP Injection in Librenms

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 2026-10-12.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Librenms

Weakness classification (CWE)

CWE-90 — LDAP Injection

References

github.com/librenms/librenms/security/advisories/GHSA-7cmx-65c5-8h8v (vendor-advisory)
www.vulncheck.com/advisories/librenms-before-26.9.0-ldap-filter-injection-authe… (third-party-advisory)

Frequently asked questions

What is CVE-2026-109357?: CVE-2026-109357 is a high-severity vulnerability in Librenms, classified under LDAP Injection. CVSS score: 8.1/10. Published 2026-10-12.
How severe is CVE-2026-109357?: High severity. CVSS v3 base score is 8.1 out of 10.