CVE-2026-34218 ClearanceKit: Managed and user-defined policy rules not enforced between opfilter start and first policy modification

Medium 6.3 Published 31 Mar 2026 Updated 2 Apr 2026

Attackers can bypass file-access policies on macOS before the first policy modification, allowing unauthorized file access until GUI interaction occurs.

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

What is CVE-2026-34218?

CVE-2026-34218 is a medium-severity missing authorization vulnerability in craigjbass clearancekit, published on 31 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. Prior to version 4.2.14, two related startup defects created a window during which only the single compile-time baseline rule was enforced by opfilter. All managed (MDM-delivered) and user-defined file-access rules were not applied until the user interacted with policies through the GUI, triggering a policy mutation over XPC. This issue has been patched in version 4.2.14.

Weakness: CWE-269

Which versions are affected by CVE-2026-34218?

It affects 1 product.

Products include Craigjbass Clearancekit.

How do I fix CVE-2026-34218?

No fix has been published for CVE-2026-34218 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-34218 being exploited?

There is no known exploitation of CVE-2026-34218 in the wild and no public exploit code.

Sources

Also known as GHSA-fpmv-5wgw-qhhr.