CVE-2026-40599

Description

ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies. Prior to 5.0.5, ClearanceKit incorrectly treats a process with an empty Team ID and a non-empty Signing ID as an Apple platform binary. This bug allows a malicious software to impersonate an apple process in the global allowlist, and access all protected files. This vulnerability is fixed in 5.0.5.

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CVSS v3.1 Score

7.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0001

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-863 Incorrect Authorization

Affected Products

Vendor	Product	Versions
craigjbass	clearancekit	< 5.0.5
apple	macos	All

References

Advisories & Patches

https://github.com/craigjbass/clearancekit/security/advisories/GHSA-w253-42qp-5f2x https://github.com/craigjbass/clearancekit/security/advisories/GHSA-w253-42qp-5f2x

Exploits

https://github.com/craigjbass/clearancekit/security/advisories/GHSA-w253-42qp-5f2x https://github.com/craigjbass/clearancekit/security/advisories/GHSA-w253-42qp-5f2x

Frequently Asked Questions

What is CVE-2026-40599? +

ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies. Prior to 5.0.5, ClearanceKit incorrectly treats a process with an empty Team ID and a non-empty Signing ID as an Apple platform binary. This bug allows a malicious software to impersonate an apple process in the global allowlist, and access all protected files. This vulnerability is fixed in 5.0.5. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-40599? +

CVE-2026-40599 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0001, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-40599? +

CVE-2026-40599 affects products from apple, craigjbass, specifically: clearancekit, macos. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-40599? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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