Home/CVE/ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies. Prior to 5.0.6, the
CVE
CVE-2026-40604
ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies. Prior to 5.0.6, the
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.
MEDIUM · CVSS 4.4
EPSS 0.00022
EPSS exploitation odds0.02% · top 93%
Monitor
- No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules8
YARA rules0
Look this up elsewhere - one-click external pivots
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How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2026-40604, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked.
EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal.
CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score.
Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits.
PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
EPSS exploitation probability
0.02%
Top 93%odds of exploitation in the next 30 days
CVSS metric silhouette
shape grows toward worst-case
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Tech impact
partial
CVSS vector breakdown
Exploitability - how they get in
Attack Vector
Network
Adjacent
Local
Physical
Attack Complexity
Low
High
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Impact - what breaks
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
VECTOR
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:HLifecycle
- 21 Apr 2026Published to NVD
- 24 Apr 2026Last modified
Every entry is a recorded date - NVD publish/modify, CISA KEV add, public exploit disclosure. No inferred events.
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ATT&CK techniques
6Techniques this CVE enables - linked via CWE → CAPEC → ATT&CK. Pills with a solid outline are named directly in ATT&CK or Nuclei templates (high confidence); the others are linked through weakness mappings.
T1574.010 · Services File Permissions Weakness T1083 · File and Directory Discovery T1574.005 · Executable Installer File Permissions Weakness T1611 · Escape to Host T1040 · Network Sniffing T1565.002 · Transmitted Data Manipulation
▤ Build a SIEM detection for these techniques
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CAPEC attack patterns
12Attack patterns this CVE enables - the bridge from weakness to ATT&CK technique.
CAPEC-CAPEC-1 · Accessing Functionality Not Properly Constrained by ACLs CAPEC-CAPEC-107 · Cross Site Tracing CAPEC-CAPEC-127 · Directory Indexing CAPEC-CAPEC-17 · Using Malicious Files CAPEC-CAPEC-20 · Encryption Brute Forcing CAPEC-CAPEC-22 · Exploiting Trust in Client CAPEC-CAPEC-237 · Escaping a Sandbox by Calling Code in Another Language CAPEC-CAPEC-36 · Using Unpublished Interfaces or Functionality CAPEC-CAPEC-477 · Signature Spoofing by Mixing Signed and Unsigned Content CAPEC-CAPEC-480 · Escaping Virtualization CAPEC-CAPEC-51 · Poison Web Service Registry CAPEC-CAPEC-57 · Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
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Weakness Classification
CWE-693Protection Mechanism Failure
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Affected Products & Versions
1craigjbass clearancekit< 5.0.6
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Related CVEs
8CVEs linked to this one by a shared weakness (CWE) or affected product - joins on data already in the engine, with the reason shown per row. Not a guess.
CVE-2011-3151
The Ubuntu SELinux initscript before version 1:0.10 used touch to create a lockf...
same CWE-693
MEDIUM
CVE-2013-0431
Unspecified vulnerability in the Java Runtime Environment (JRE) component in Ora...
same CWE-693
MEDIUM
CVE-2013-2465
Unspecified vulnerability in the Java Runtime Environment (JRE) component in Ora...
same CWE-693
CRITICAL
CVE-2014-125107
A vulnerability was found in Corveda PHPSandbox 1.3.4 and classified as critical...
same CWE-693
MEDIUM
CVE-2026-33631
ClearanceKit intercepts file-system access events on macOS and enforces per-proc...
same product
HIGH
CVE-2026-33632
ClearanceKit intercepts file-system access events on macOS and enforces per-proc...
same product
HIGH
CVE-2026-34218
ClearanceKit intercepts file-system access events on macOS and enforces per-proc...
same product
MEDIUM
CVE-2026-40599
ClearanceKit intercepts file-system access events on macOS and enforces per-proc...
same product
HIGH
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Sigma Hunt Rules
8Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSuspicious Microsoft Office Child Process - MacOS
producthighRemote Access Tool - Renamed MeshAgent Execution - MacOS
producthighBinary Padding - MacOS
productmediumSuspicious Execution via macOS Script Editor
productmediumSystem Information Discovery Via Sysctl - MacOS
productmediumNew File Exclusion Added To Time Machine Via Tmutil - MacOS
productmediumSuspicious MacOS Firmware Activity
productmediumDisk Image Mounting Via Hdiutil - MacOS
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References & Sources
1Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.