ClearanceKit: opfilter policy bypass via non-open file operations

ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies. In versions on the 4.1 branch and earlier, the opfilter Endpoint Security system extension enforced file access policy exclusively by intercepting ES_EVENT_TYPE_AUTH_OPEN events. Seven additional file operation event types were not intercepted, allowing any locally running process to bypass the configured FAA policy without triggering a denial. Commit a3d1733 adds subscriptions for all seven event types and routes them through the existing FAA policy evaluator. AUTH_RENAME and AUTH_UNLINK additionally preserve XProtect change detection: events on the XProtect path are allowed and trigger the existing onXProtectChanged callback rather than being evaluated against user policy. All versions on the 4.2 branch contain the fix. No known workarounds are available.

Problem type

CWE-862: Missing Authorization

Affected products

craigjbass

clearancekit

< 4.2 - AFFECTED

References

https://github.com/craigjbass/clearancekit/security/advisories/GHSA-25f8-8cj2-m887

https://github.com/craigjbass/clearancekit/security/advisories/GHSA-25f8-8cj2-m887

x_refsource_CONFIRM

https://github.com/craigjbass/clearancekit/commit/a3d1733d2691a0d40209c48b01bf9291bf645207

https://github.com/craigjbass/clearancekit/commit/a3d1733d2691a0d40209c48b01bf9291bf645207

x_refsource_MISC

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-33631

Click to expand

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-33631",
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "dateUpdated": "2026-03-26T19:32:15.556Z",
    "dateReserved": "2026-03-23T14:24:11.618Z",
    "datePublished": "2026-03-26T19:30:30.379Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M",
        "dateUpdated": "2026-03-26T19:32:15.556Z"
      },
      "title": "ClearanceKit: opfilter policy bypass via non-open file operations",
      "descriptions": [
        {
          "lang": "en",
          "value": "ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies. In versions on the 4.1 branch and earlier, the opfilter Endpoint Security system extension enforced file access policy exclusively by intercepting ES_EVENT_TYPE_AUTH_OPEN events. Seven additional file operation event types were not intercepted, allowing any locally running process to bypass the configured FAA policy without triggering a denial. Commit a3d1733 adds subscriptions for all seven event types and routes them through the existing FAA policy evaluator. AUTH_RENAME and AUTH_UNLINK additionally preserve XProtect change detection: events on the XProtect path are allowed and trigger the existing onXProtectChanged callback rather than being evaluated against user policy. All versions on the 4.2 branch contain the fix. No known workarounds are available."
        }
      ],
      "affected": [
        {
          "vendor": "craigjbass",
          "product": "clearancekit",
          "versions": [
            {
              "version": "< 4.2",
              "status": "affected"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-862: Missing Authorization",
              "cweId": "CWE-862",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/craigjbass/clearancekit/security/advisories/GHSA-25f8-8cj2-m887",
          "name": "https://github.com/craigjbass/clearancekit/security/advisories/GHSA-25f8-8cj2-m887",
          "tags": [
            "x_refsource_CONFIRM"
          ]
        },
        {
          "url": "https://github.com/craigjbass/clearancekit/commit/a3d1733d2691a0d40209c48b01bf9291bf645207",
          "name": "https://github.com/craigjbass/clearancekit/commit/a3d1733d2691a0d40209c48b01bf9291bf645207",
          "tags": [
            "x_refsource_MISC"
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L",
            "attackVector": "LOCAL",
            "attackComplexity": "LOW",
            "privilegesRequired": "LOW",
            "userInteraction": "NONE",
            "scope": "CHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "availabilityImpact": "LOW",
            "baseScore": 8.7,
            "baseSeverity": "HIGH"
          }
        }
      ]
    }
  }
}