What’s Vulnerable › Vulnerabilities
CVE-2026-40604: ClearanceKit: opfilter system extension can be suspended or signalled by a root process, disabling file-access policy enforcement
- Severity: medium (CVSS 4.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-21 · updated 2026-10-26
- Weakness: CWE-693
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.
Affected products
- craigjbass clearancekit: before 5.0.6 — fixed in 5.0.6
How to fix
Upgrade to a fixed version: craigjbass clearancekit 5.0.6. Check the vendor advisory for mitigations.
References
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