CVE-2024-27837

Local Keychain access via insufficient code-signing restrictions

Published May 13, 2024 · Updated Apr 2, 2026

A downgrade flaw in AppleMobileFileIntegrity in Apple macOS before 14.5 allows local users to access Keychain items. Apple identifies insufficient code-signing restrictions as the cause but has not disclosed the validation path that accepts downgraded code. Local execution is required to reach the affected integrity checks, and the reported consequence is limited to access to Keychain items.

CVSS severity3.3
Low
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A downgrade flaw in AppleMobileFileIntegrity in Apple macOS before 14.5 allows local users to access Keychain items. Apple identifies insufficient code-signing restrictions as the cause but has not disclosed the validation path that accepts downgraded code. Local execution is required to reach the affected integrity checks, and the reported consequence is limited to access to Keychain items.

The record

CVE
CVE-2024-27837
Published
May 13, 2024
Updated
Apr 2, 2026
Vendor
Apple
Product
macOS
Classifications
CWE-280, T1555.001
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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=0 <14.5
  2. Affected versionversion=- <14.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Apple · macOSversion=0 <14.5; version=- <14.5

Published CVSS scores

3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
7.7CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-280Improper Handling of Insufficient Permissions or Privileges
T1555.001Credentials from Password Stores: Keychain

Public exploit references

No public exploit references are available in this record.

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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