Apache Karaf: Authorization bypass in JMX MBean lifecycle operations

{
  "id": "e926fb11b565bad2d843f581d9265e9524e88977aa4a3187c442c23ec01387e9",
  "url": "https://osv.dev/vulnerability/CVE-2026-92142",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Apache Karaf: Authorization bypass in JMX MBean lifecycle operations",
    "summary": "Apache Karaf exposes a JMX MBeanServer guarded by KarafMBeanServerGuard, which enforces role-based access control (RBAC) on MBean operations invoked over the remote JMX connector (RMI registry/server, enabled by default on ports 1099 and 44444). The guard is implemented as a java.lang.reflect.Proxy around the MBeanServer, and only forwards a fixed list of operation names to the RBAC check, defined in MBeanInvocationHandler#guarded: private final List guarded = Collections.unmodifiableList( Arrays.asList(\"invoke\", \"getAttribute\", \"getAttributes\", \"setAttribute\", \"setAttributes\")); The MBean lifecycle operations MBeanServer#createMBean, #registerMBean and #unregisterMBean are not in this list. Calls to these methods are forwarded directly to the underlying MBeanServer with no role check at all, regardless of the roles configured in etc/jmx.acl.*.cfg. As a result, any user who can authenticate to the JMX endpoint, including a user holding only the least-privileged \"viewer\" role, can call createMBean() to instantiate an arbitrary class as a MBean, and unregisterMBean() to remove it again afterwards, with no authorization check and no audit log entry (logging in KarafMBeanServerGuard only occurs on the RBAC-denial path, which this bypass never reaches). This is significant because javax.management.loading.MLet, a standard JDK MBean, can be instantiated this way. MLet acts as a remote classloader: its getMBeansFromURL(URL) operation fetches an MLet text file from an attacker-contro",
    "evidence": "osv:CVE-2026-92142",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-92142",
      "aliases": [
        "CVE-2026-92142"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apache/karaf",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "189048fff3422afaadcbbb57d95b257cb35248ad"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:karaf:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.4.12"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "karaf-4.4.8",
            "karaf-4.4.7",
            "karaf-4.4.6",
            "karaf-4.4.5",
            "karaf-4.4.4",
            "karaf-4.4.3",
            "karaf-4.4.2",
            "karaf-4.4.1",
            "karaf-4.4.0",
            "karaf-4.3.3",
            "karaf-4.3.2",
            "karaf-4.3.1",
            "karaf-4.3.0",
            "karaf-4.3.0.RC1",
            "karaf-4.2.3",
            "karaf-4.2.2",
            "karaf-4.2.1",
            "karaf-4.2.0",
            "karaf-4.2.0.M2",
            "karaf-4.2.0.M1",
            "karaf-4.1.1",
            "karaf-4.1.0",
            "karaf-4.0.4",
            "karaf-4.0.3",
            "karaf-4.0.2",
            "karaf-4.0.1",
            "karaf-4.0.0.M2",
            "karaf-4.0.0.M1",
            "karaf-3.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92142.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.608238602Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92142.json",
        "https://karaf.apache.org/security/cve-2026-92142.txt",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-92142"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "apache",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "4.4.12"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92142.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-92142",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501045,
  "published_at": "2026-09-29T08:40:07.961+00:00"
}