CVE-2026-33631 ClearanceKit: opfilter policy bypass via non-open file operations

High 8.7 Published 26 Mar 2026 Updated 30 Mar 2026

Local attackers can bypass file access policies in ClearanceKit by using file operations not intercepted by the security extension.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-33631?

CVE-2026-33631 is a high-severity vulnerability in craigjbass clearancekit, published on 26 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-862

Which versions are affected by CVE-2026-33631?

It affects 1 product.

Products include Craigjbass Clearancekit.

How do I fix CVE-2026-33631?

No fix has been published for CVE-2026-33631 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-33631 being exploited?

There is no known exploitation of CVE-2026-33631 in the wild and no public exploit code.

Sources

Also known as GHSA-25f8-8cj2-m887.