---
id: CVE-2025-43521
title: >-
  A downgrade issue affecting Intel-based Mac computers was addressed with
  additional code-signing restrictions
summary: >-
  A downgrade issue affecting Intel-based Mac computers was addressed with
  additional code-signing restrictions. This issue is fixed in macOS Sequoia
  15.7.3, macOS Tahoe 26.2. An app may be able to access sensitive user data.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-347
vendor: apple
product: macos
affected:
  - macos < 15.7.3
patched:
  - macos 15.7.3
published: '2025-12-12'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T20:10:01.970'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-43521'
references:
  - url: 'https://support.apple.com/en-us/125886'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/125887'
    label: product-security@apple.com
tags:
  - nvd
epss: 0.00132
epssPercentile: 0.02348
ingestedAt: '2026-10-07T20:46:46.919Z'
---

## Overview

A downgrade issue affecting Intel-based Mac computers was addressed with additional code-signing restrictions. This issue is fixed in macOS Sequoia 15.7.3, macOS Tahoe 26.2. An app may be able to access sensitive user data.

## Affected

- `macos < 15.7.3`

## Remediation

Upgrade past the affected range:

- `macos 15.7.3`