ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies. Prior to 5.0.6, the opfilter Endpoint Security system extension (bundle ID uk.craigbass.clearancekit.opfilter) can be suspended with SIGSTOP or kill -STOP, or killed with SIGKILL/SIGTERM, by any process running as root. While the extension is suspended, all AUTH Endpoint Security events time out and default to allow, silently disabling ClearanceKit's file-access policy enforcement for the duration of the suspension. This vulnerability is fixed in 5.0.6.
History

Fri, 24 Apr 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Apple
Apple macos
CPEs cpe:2.3:a:craigjbass:clearancekit:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
Vendors & Products Apple
Apple macos
Metrics cvssV3_1

{'score': 4.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'}


Wed, 22 Apr 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Craigjbass
Craigjbass clearancekit
Vendors & Products Craigjbass
Craigjbass clearancekit

Wed, 22 Apr 2026 00:00:00 +0000

Type Values Removed Values Added
Description ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies. Prior to 5.0.6, the opfilter Endpoint Security system extension (bundle ID uk.craigbass.clearancekit.opfilter) can be suspended with SIGSTOP or kill -STOP, or killed with SIGKILL/SIGTERM, by any process running as root. While the extension is suspended, all AUTH Endpoint Security events time out and default to allow, silently disabling ClearanceKit's file-access policy enforcement for the duration of the suspension. This vulnerability is fixed in 5.0.6.
Title ClearanceKit: opfilter system extension can be suspended or signalled by a root process, disabling file-access policy enforcement
Weaknesses CWE-693
References
Metrics cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:H/SI:H/SA:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-04-21T17:41:53.580Z

Updated: 2026-04-21T20:36:53.181Z

Reserved: 2026-04-14T14:07:59.642Z

Link: CVE-2026-40604

cve-icon Vulnrichment

Updated: 2026-04-21T19:55:06.310Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-21T18:16:51.977

Modified: 2026-04-24T20:49:22.970

Link: CVE-2026-40604

cve-icon Redhat

No data.