Vulnerability details
CVE-2026-109357
librenms librenms
LibreNMS before 26.9.0 LDAP Filter Injection Authentication Bypass via Authorization Header
CVSS 4.0
9.2Critical
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.2Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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 |
| 8.1High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| librenms | librenms | v < 26.9.0 | CVEProject cvelistV5 (CNA) |
References and advisories
2
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Details
- Published
- 2026-10-12
- Last updated
- 2026-10-15
- State
- Published
- Assigner (CNA)
- VulnCheck
- Kolun priority
- 26 · Low
Exploit prediction (EPSS)
0.59%
Probability of exploitation in 30 days
48.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-90Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')