Lemur: LDAP Filter Injection enables post-authentication privilege escalation

{
  "id": "8c0a642b880b83aed7afe1ccc34c426a1fa2073b7e0586771782902374e9afd1",
  "url": "https://osv.dev/vulnerability/CVE-2026-44304",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Lemur: LDAP Filter Injection enables post-authentication privilege escalation",
    "summary": "Lemur manages TLS certificate creation. Prior to 1.9.0, Lemur's LDAP authentication module (lemur/auth/ldap.py) constructs LDAP search filters using unsanitized user input via Python string interpolation. An authenticated LDAP user can inject LDAP filter metacharacters through the username field to manipulate group membership queries and escalate their privileges to administrator. This vulnerability is fixed in 1.9.0.",
    "evidence": "osv:CVE-2026-44304",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-44304",
      "aliases": [
        "CVE-2026-44304",
        "GHSA-3r34-vq8m-39gh",
        "PYSEC-2026-2585"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/netflix/lemur",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "f59087a51b986595af49c7e1bc89913632c0d625"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.9.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.9.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.8.2",
            "v1.8.1",
            "v1.8.0",
            "v1.7.0",
            "v1.6.0",
            "v1.5.0",
            "v1.4.0",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.0",
            "v1.1.0",
            "v1.0.0",
            "v0.11.0",
            "v0.10.0",
            "v0.9.0",
            "v0.8.1",
            "0.8.0",
            "0.7.0",
            "0.6.0",
            "0.5.0",
            "0.4.0",
            "0.3.0",
            "0.2.2",
            "0.2.1",
            "0.2",
            "0.1.5",
            "0.1.4",
            "0.1.3",
            "0.1.2",
            "0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44304.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.762287330Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44304.json",
        "https://github.com/Netflix/lemur/security/advisories/GHSA-3r34-vq8m-39gh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44304"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-90"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44304.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44304",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517002,
  "published_at": "2026-05-12T21:27:28.118+00:00"
}