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Critical

LibreNMS before 26.9.0 LDAP Filter Injection Authentication Bypass via Authorization Header

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-109357

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-109357

librenms

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "librenms",
    "product": "librenms",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "26.9.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "26.9.0",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-109357

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#28502 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement