HOMEVULNERABILITIESCVE-2026-40604
MEDIUM

CVE-2026-40604

CWE-693Published: April 21, 2026· Updated: Apr 24, 2026

4.4
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:4.3th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-40604 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 4.4.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.High
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Apple1 product
macos
craigjbass1 product
clearancekit
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://github.com/craigjbass/clearancekit/security/advisories/GHSA-5r9w-9fg6-266q

All References (1)

→
https://github.com/craigjbass/clearancekit/security/advisories/GHSA-5r9w-9fg6-266qVendor Advisory

Quick Facts

CVE IDCVE-2026-40604
CVSS Score4.4 / 10
SeverityMEDIUM
WeaknessCWE-693
CISA KEVNo
EPSS (30d)0.02%
Affected2 vendors
PublishedApr 21, 2026

Related CVEs (CWE-693)

CVE-2026-34208
10.0
CVE-2026-34938
10.0
CVE-2026-47140
10.0
CVE-2026-45102
9.9
CVE-2024-55024
9.8
CVE-2026-26956
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-40604 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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