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OpenClaw Matrix before 2026.8.1 Authorization Bypass via Case Folding

Type: advisorySources: OSV

OpenClaw's Matrix integration (npm package @openclaw/matrix) versions >= 2026.2.2 and < 2026.8.1 lowercase complete Matrix user IDs — including historical localparts and the case-sensitive server-name portion — when deriving the OpenClaw authorization identity. As a result, distinct authenticated Matrix accounts can normalize to the same authorization identity. A Matrix participant controlling a colliding account identifier (a protocol-valid identifier that differs from the configured one only by characters OpenClaw case/Unicode folds; display-name matching is not required) can inherit allowlist, owner-command, exec-approval, or plugin-approval authority configured for another account. The issue is fixed in 2026.8.1.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-100541
Confirmed fixed CVEs
Not specified
Updated in this feed
6 Nov 2026, 02:12 UTC · Revision 1

Source evidence

OpenClaw Matrix before 2026.8.1 Authorization Bypass via Case Folding

core-osv · Original source

Published 26 Sept 2026, 02:18 UTC

OpenClaw's Matrix integration (npm package @openclaw/matrix) versions >= 2026.2.2 and < 2026.8.1 lowercase complete Matrix user IDs — including historical localparts and the case-sensitive server-name portion — when deriving the OpenClaw authorization identity. As a result, distinct authenticated Matrix accounts can normalize to the same authorization identity. A Matrix participant controlling a colliding account identifier (a protocol-valid identifier that differs from the configured one only by characters OpenClaw case/Unicode folds; display-name matching is not required) can inherit allowlist, owner-command, exec-approval, or plugin-approval authority configured for another account. The issue is fixed in 2026.8.1.

osv:CVE-2026-100541
Complete source record
{
  "id": "466367ac52ae5c815e3624613f61e7622d132738064425692032467cddfaaf9a",
  "url": "https://osv.dev/vulnerability/CVE-2026-100541",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OpenClaw Matrix before 2026.8.1 Authorization Bypass via Case Folding",
    "summary": "OpenClaw's Matrix integration (npm package @openclaw/matrix) versions >= 2026.2.2 and < 2026.8.1 lowercase complete Matrix user IDs — including historical localparts and the case-sensitive server-name portion — when deriving the OpenClaw authorization identity. As a result, distinct authenticated Matrix accounts can normalize to the same authorization identity. A Matrix participant controlling a colliding account identifier (a protocol-valid identifier that differs from the configured one only by characters OpenClaw case/Unicode folds; display-name matching is not required) can inherit allowlist, owner-command, exec-approval, or plugin-approval authority configured for another account. The issue is fixed in 2026.8.1.",
    "evidence": "osv:CVE-2026-100541",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-100541",
      "aliases": [
        "CVE-2026-100541",
        "GHSA-hgv5-f2r3-6v9r"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openclaw/openclaw",
              "type": "GIT",
              "events": [
                {
                  "introduced": "95cd2210f93d6ab2acc5e29dbad6065294365863"
                },
                {
                  "fixed": "ea806575e6450e4d1efdfc72c19f04be982a1b9b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2026.2.2"
                      },
                      {
                        "fixed": "2026.8.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2026.8.1"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
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            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100541.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:46.331676053Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100541.json",
        "https://github.com/openclaw/openclaw/security/advisories/GHSA-hgv5-f2r3-6v9r",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100541",
        "https://www.vulncheck.com/advisories/openclaw-matrix-before-2026.8.1-authorization-bypass-via-case-folding"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-178"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100541.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-100541",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514177,
  "published_at": "2026-09-26T02:18:39.224+00:00"
}