CVE-2017-13909

Local iCloud token disclosure via insecure storage

Published Dec 23, 2021 · Updated Aug 5, 2024

Insecure token storage in Apple macOS before 10.13 allows local users to read iCloud authentication tokens from local storage. Apple Account Settings stores these sensitive tokens outside Keychain; Apple has not disclosed the exact storage locus or access operation. Access requires a local low-privileged account, and the documented consequence is token disclosure rather than data modification or service interruption.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure token storage in Apple macOS before 10.13 allows local users to read iCloud authentication tokens from local storage. Apple Account Settings stores these sensitive tokens outside Keychain; Apple has not disclosed the exact storage locus or access operation. Access requires a local low-privileged account, and the documented consequence is token disclosure rather than data modification or service interruption.

The record

CVE
CVE-2017-13909
Published
Dec 23, 2021
Updated
Aug 5, 2024
Vendor
Apple
Product
macOS
Classifications
CWE-922, T1528
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record 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=unspecified <10.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Apple · macOSversion=unspecified <10.13

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-922Insecure Storage of Sensitive Information
T1528Steal Application Access Token

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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