CVE-2026-40604: high-severity vulnerability in craigjbass clearancekit
ClearanceKit: opfilter system extension can be suspended or signalled by a root process, disabling file-access policy enforcement
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.2epss 0.1%
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.
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
Affected products
craigjbass · clearancekitRelated CVEs — craigjbass clearancekit
In the same product, most dangerous first.
CVE-2026-34218MEDIUMClearanceKit: Managed and user-defined policy rules not enforced between opfilter start and first policy modificationEPSS 0.2%CVE-2026-47134MEDIUMClearanceKit: Policy signing key in System Keychain has permissive ACL allowing any local-root process to forge signed policyEPSS 0.2%CVE-2026-47133MEDIUMClearanceKit's signed policy tables lack monotonic counter, allowing replay of older legitimately-signed snapshotsEPSS 0.2%CVE-2026-40599HIGHClearanceKit: Ad-hoc signed binaries can spoof Apple process identities in the global allowlistEPSS 0.1%CVE-2026-40191MEDIUMClearanceKit has a policy bypass via dual-path Endpoint Security events checking only source pathEPSS 0.1%CVE-2026-33632HIGHClearanceKit: opfilter policy bypass via exchangedata and clone operationsEPSS 0.1%