CVE-2026-33631CWE-862

ClearanceKit: opfilter policy bypass via non-open file operations

High · published March 26, 2026

CVSS v3.1
8.7
EPSS
0%
Percentile
3.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.7 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00146 · 3.5th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-03-26T19:30Z
EPSS history
Timeline
  • 26 MAR 19:30Z
    ClearanceKit: opfilter policy bypass via non-open file operations
    cvelistv5