CVE-2026-109357
LibreNMS before 26.9.0 contains an LDAP filter injection in ldap-authorization and ad-authorization…
- Risk score
- 61/100
- CVSS
- 8.1 v3.1
- Exploit chance (30 days)
- 0.5%
- Published
- 12 Oct 2026
Open in the live forecast Today's forecast
What to know
- 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 B…
- Affected
- See advisory
- Fix
- Upgrade the product to 26.9.0 or later.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 8.1 high
- Remotely exploitable without logging in
References
Original 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.
Last activity 12 Oct 2026. Patch Forecast updates every hour.