---
id: "CVE-2026-86907"
kind: "vulnerability"
aliases: ["CVE-2026-86907"]
title: "macOS: an admin-privileged app can modify the System Keychain"
severity: "medium"
cvss: 4.4
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["apple-devices", "fleet-management", "infrastructure", "macos"]
not_affected_if: ["already-patched", "standard-users-only"]
published_at: "2026-10-20T01:17:26+00:00"
first_seen_at: "2026-10-23T21:57:19+00:00"
updated_at: "2026-10-25T04:37:12+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86907", "first_seen_at": "2026-10-23T21:57:19+00:00"}]
---

# macOS: an admin-privileged app can modify the System Keychain

Apple fixed an authorization flaw in macOS that lets an app holding admin privileges change the System Keychain. An attacker who already has admin rights on a Mac could alter stored system credentials and trust settings.

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

## How to check

- Run `sw_vers -productVersion` and compare against the fixed versions: `15.8` on macOS Sequoia, `26.7` on macOS Tahoe.

## Fix

- Update macOS to `15.8` (Sequoia) or `26.7` (Tahoe) or later via System Settings > General > Software Update.

## Timeline

- 2026-10-23T21:57:19+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-86907

## From the sources

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.

---

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