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Vulnerability record · CVE-2026-109357 · published 12 October 2026

CVE-2026-109357: LDAP injection vulnerability

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.

9.2 CVSS 4.0 Critical EPSS 0.46% · top 61.7% CWE-90 · LDAP injection Awaiting Analysis
9.2CVSS 4.0 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
15 Oct 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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-authorizatio
https://github.com/librenms/librenms/security/advisories/GHSA-7cmx-65c5-8h8v

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Source: NIST National Vulnerability Database (record CVE-2026-109357), CISA KEV, FIRST EPSS (scores of 2026-10-17). This page is refreshed as NVD updates the record.