---
id: "CVE-2026-86868"
kind: "vulnerability"
aliases: ["CVE-2026-86868"]
title: "macOS: authentication state flaw lets an attacker impersonate other users"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "macos"]
not_affected_if: []
published_at: "2026-10-20T01:17:24+00:00"
first_seen_at: "2026-10-23T21:57:19+00:00"
updated_at: "2026-10-25T05:06:10+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86868", "first_seen_at": "2026-10-23T21:57:19+00:00"}]
---

# macOS: authentication state flaw lets an attacker impersonate other users

Apple fixed an authentication issue in macOS that stems from state management. An attacker may be able to impersonate other users on an affected Mac.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed macOS version under Apple menu > About This Mac, or run `sw_vers -productVersion`
- Compare against the fixed builds: macOS Golden Gate 27, macOS Sequoia `15.8`, macOS Tahoe `26.7`

## Fix

- Update macOS to Golden Gate 27, Sequoia `15.8`, or Tahoe `26.7` or later via System Settings > General > Software Update

## Timeline

- 2026-10-23T21:57:19+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-86868

## From the sources

An authentication issue was addressed with improved state management. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An attacker may be able to impersonate other users.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_