NanoClaw < 2.1.0 - Privilege Escalation via Forged Channel Approval Callback

{
  "id": "80389522212b6a9d7e98afb81c313b8aae25075ecc6741194fd7b550f1c5e5f9",
  "url": "https://osv.dev/vulnerability/CVE-2026-56694",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "NanoClaw < 2.1.0 - Privilege Escalation via Forged Channel Approval Callback",
    "summary": "NanoClaw before 2.1.0 contains a privilege escalation vulnerability in the channel-registration approval flow where handleChannelApprovalResponse fails to validate admin privileges over target agent groups. Scoped admins can submit forged or stale connect callback values to wire messaging channels into out-of-scope agent groups, exposing unauthorized groups to unapproved channels and enabling unauthorized observation or control of restricted agent group activity.",
    "evidence": "osv:CVE-2026-56694",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-56694",
      "aliases": [
        "CVE-2026-56694"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nanocoai/nanoclaw",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "092487d7adf3d22919d4272601f6f392bccd0334"
                },
                {
                  "fixed": "0eef8fafdd7c475ab5fd8d37ea566a81e74cd834"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.1.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0eef8fafdd7c475ab5fd8d37ea566a81e74cd834"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.0.64",
            "v2.0.63",
            "v2.0.54",
            "v1.2.0",
            "v1.1.6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56694.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.450398790Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56694.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-56694",
        "https://www.vulncheck.com/advisories/nanoclaw-privilege-escalation-via-forged-channel-approval-callback",
        "https://github.com/nanocoai/nanoclaw/commit/0eef8fafdd7c475ab5fd8d37ea566a81e74cd834",
        "https://github.com/nanocoai/nanoclaw/pull/2566",
        "https://github.com/nanocoai/nanoclaw"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56694.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-56694",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493871,
  "published_at": "2026-06-23T15:35:41.347+00:00"
}