CVE-2026-109357CWE-90

CVE-2026-109357

High · published October 12, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
38.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
9.2 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00458 · 38.8th percentile
Weakness
CWE-90 · Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
Published
2026-10-12T21:17Z
References (3)
https://github.com/librenms/librenms/security/advisories/GHSA-7cmx-65c5-8h8v · [email protected]https://www.vulncheck.com/advisories/librenms-before-26.9.0-ldap-filter-injection-authentication-bypass-via-authorization-header · [email protected]https://github.com/librenms/librenms/security/advisories/GHSA-7cmx-65c5-8h8v · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 12 OCT 16:05Z
    LibreNMS before 26.9.0 LDAP Filter Injection Authentication Bypass via Authorization Header
    cvelistv5
  • 12 OCT 16:05Z
    LibreNMS before 26.9.0 LDAP Filter Injection Authentication Bypass via Authorization Header
    cvelistv5