Exploited vulnerabilities / CVE-2026-65400
Confirmed exploited · authentication bypass · Apple macOSCVE-2026-65400
Apple macOS authentication bypass, confirmed exploited in the wild.
Apple macOS contains an improper authentication vulnerability that could allow an attacker on the network to authenticate to Screen Sharing without valid credentials.
| CISA's name for it | Apple macOS Improper Authentication Vulnerability |
|---|---|
| Vendor and product | Apple · macOS |
| Type | authentication bypass · CWE-287 |
| Exploited | Confirmed by CISA listed 18 August 2026 |
| Likelihood | one of the most likely to be exploited of every vulnerability tracked |
| Deadline | 21 August 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | support.apple.com ↗ · support.apple.com ↗ · support.apple.com ↗ · www.cisa.gov ↗ |
Three steps, in this order
Apply the vendor fix and restart the affected service.
Put the login or management interface behind a VPN or allow-list; a bypass makes passwords irrelevant.
Rotate credentials and session keys the product holds, and review accounts and configuration changes since the listing date.
| CISA's required action | Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. |
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Know before someone else finds it
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CVE-2026-65400 in short
Is CVE-2026-65400 being exploited?
Yes. CISA added CVE-2026-65400 to its Known Exploited Vulnerabilities catalogue on 18 August 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2026-65400?
US federal agencies must remediate it by 21 August 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2026-65400 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 18%, the 97th percentile of every CVE it scores.
How do I fix CVE-2026-65400?
Apply the vendor fix and restart the affected service. Put the login or management interface behind a VPN or allow-list; a bypass makes passwords irrelevant. Rotate credentials and session keys the product holds, and review accounts and configuration changes since the listing date.
Other Apple vulnerabilities being exploited
| CVE | Product | Type | Listed |
|---|---|---|---|
| CVE-2024-27834 | Multiple Products | authentication bypass | 4 November 2026 |
| CVE-2026-86950 | Multiple Products | remote code execution | 29 September 2026 |
| CVE-2025-43510 | Multiple Products | exploited vulnerability | 20 March 2026 |
| CVE-2025-43520 | Multiple Products | memory corruption | 20 March 2026 |
| CVE-2025-31277 | Multiple Products | memory corruption | 20 March 2026 |
| CVE-2023-43000 | Multiple Products | memory corruption | 5 March 2026 |
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.