OpenClaw before 2026.8.1 Authentication Bypass via Session Reset

{
  "id": "56fa1959a317ecc8e8cbc7c9a14dc4422a4d9eded795a60cbf36650a4f93b76b",
  "url": "https://osv.dev/vulnerability/CVE-2026-100556",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OpenClaw before 2026.8.1 Authentication Bypass via Session Reset",
    "summary": "OpenClaw (npm package openclaw) versions >= 2026.5.2 and < 2026.8.1 contain an incorrect authorization vulnerability in WhatsApp group handling. A group sender who is admitted for ordinary messages but denied by commands.allowFrom or owner command authorization can issue the /new command to reset the shared group session and persist a provider and model override. This allows a command-denied group member to select a provider and model already permitted by the operator for subsequent turns in the shared group session, potentially changing provider routing, cost, data flow, or availability. It does not allow adding a new provider or host command execution. The issue is fixed in version 2026.8.1.",
    "evidence": "osv:CVE-2026-100556",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-100556",
      "aliases": [
        "CVE-2026-100556",
        "GHSA-mm7m-wcgh-8mfq"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openclaw/openclaw",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8b2a6e57fef6c582ec6d27b85150616f9e3a7ba4"
                },
                {
                  "fixed": "ea806575e6450e4d1efdfc72c19f04be982a1b9b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2026.5.2"
                      },
                      {
                        "fixed": "2026.8.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2026.8.1"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100556.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.327580274Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100556.json",
        "https://github.com/openclaw/openclaw/security/advisories/GHSA-mm7m-wcgh-8mfq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100556",
        "https://www.vulncheck.com/advisories/openclaw-before-2026.8.1-authentication-bypass-via-session-reset"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100556.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-100556",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505680,
  "published_at": "2026-09-26T02:18:50.427+00:00"
}