How severe is CVE-2026-40604?

CVE-2026-40604 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-40604 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40604?

CVE-2026-40604 affects Craigjbass Clearancekit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40604?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40604 have an EU (EUVD) identifier?

Yes. CVE-2026-40604 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24213.

When was CVE-2026-40604 published?

CVE-2026-40604 was published on 2026-04-21 and last updated on 2026-06-17.

CVE-2026-40604

CVE-2026-40604 is a medium-severity vulnerability in Craigjbass Clearancekit with a CVSS 3.x base score of 4.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-693.

Key facts

Severity: Medium (CVSS 3.x base score 4.4)
CVSS v4: 8.2
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24213
Weakness: CWE-693
Affected product: Craigjbass Clearancekit
Published: 2026-04-21
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-40604?: 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.
How severe is CVE-2026-40604?: CVE-2026-40604 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-40604 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40604?: CVE-2026-40604 affects Craigjbass Clearancekit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40604?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40604 have an EU (EUVD) identifier?: Yes. CVE-2026-40604 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24213.
When was CVE-2026-40604 published?: CVE-2026-40604 was published on 2026-04-21 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:craigjbass:clearancekit:*:*:*:*:*:*:*:*

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