CVE-2026-40191Public exploit

Protected-file writes via unchecked destination paths

Published Apr 10, 2026 · Updated Apr 10, 2026

Incorrect authorization in ClearanceKit before 5.0.4-beta-1f46165 allows local users to write files into protected directories. Its Endpoint Security event handler evaluated only the source path for rename, link, copyfile, exchangedata, and clone operations, leaving each destination unchecked. Low-privileged local access and a configured FAA rule or App Jail policy are required; exploitation permits placing, linking, or replacing protected files.

CVSS severity6.8
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in ClearanceKit before 5.0.4-beta-1f46165 allows local users to write files into protected directories. Its Endpoint Security event handler evaluated only the source path for rename, link, copyfile, exchangedata, and clone operations, leaving each destination unchecked. Low-privileged local access and a configured FAA rule or App Jail policy are required; exploitation permits placing, linking, or replacing protected files.

The record

CVE
CVE-2026-40191
Published
Apr 10, 2026
Updated
Apr 10, 2026
Vendor
Craig J. Bass
Product
ClearanceKit
Classifications
CWE-863, T1565.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.0.4-beta-1f46165

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Craig J. Bass · ClearanceKitversion=< 5.0.4-beta-1f46165

Published CVSS scores

6.8GitHubCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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