CVE-2026-86907

Analyzed Analyzed - Analysis Complete

Authorization Issue in macOS Sequoia Allows System Keychain Modification

Publication date: 2026-10-20

Last updated on: 2026-11-03

Assigner: Apple Inc.

Description

An authorization issue was addressed with improved entitlement checks. This issue is fixed in macOS Sequoia 15.8, macOS Tahoe 26.7. An app with admin privileges may be able to modify the System Keychain.

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Meta Information

Published

2026-10-20

Last Modified

2026-11-03

Generated

2026-11-09

AI Q&A

2026-10-20

EPSS Evaluated

2026-11-08

NVD

CVE-2026-86907

EUVD

EUVD-2026-104714

Affected Vendors & Products

Vendor	Product	Version / Range
apple	macos	to 15.8 (exc)
apple	macos	From 26.0 (inc) to 26.7 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-862	The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

Executive Summary

This is an authorization issue where an app with admin privileges could potentially modify the System Keychain due to insufficient entitlement checks. The vulnerability was addressed in macOS Sequoia 15.8 and macOS Tahoe 26.7.

Detection Guidance

This vulnerability is specific to macOS systems and requires admin privileges to modify the System Keychain. Detection involves checking macOS version and reviewing system logs for unauthorized keychain modifications. Use 'sw_vers' to check macOS version and 'log show --predicate 'eventMessage contains "Keychain"' --last 24h' to inspect keychain-related activities.

Impact Analysis

An attacker with admin access could exploit this to modify the System Keychain, potentially gaining access to sensitive data like passwords or encryption keys stored there.

Compliance Impact

The vulnerability allows an app with admin privileges to modify the System Keychain, which could expose sensitive data such as credentials or encryption keys. This may impact compliance with standards like GDPR (data protection) or HIPAA (healthcare data) by increasing the risk of unauthorized access to protected information.

Mitigation Strategies

Update to macOS Sequoia 15.8 or macOS Tahoe 26.7 to address the authorization issue. Remove unnecessary admin privileges from apps to limit potential System Keychain modifications.

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