CVE-2026-109357

critical · 9.2

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

0.6%

EPSS (exploit prob.)

48th

EPSS percentile

2026-10-12

Published

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:X/V:X/RE:X/U:X

Weaknesses

CWE-90

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-109357