Apple macOS Improper Authentication Vulnerability
Apple macOS contains an improper authentication vulnerability that could allow an attacker on the network to authenticate to Screen Sharing without valid credentials.
- Vendor
- Apple
- Product
- macOS
- CVSS
- 9.8
- EPSS (exploit probability)
- 1.7%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2026-65400 being exploited?
Yes. CISA added CVE-2026-65400 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 1.7% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
CVE-2026-65400 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply 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.
US federal civilian agencies must remediate by (3 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Apple macOS CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2019-8526 Apple macOS Use-After-Free Vulnerability | [ HIGH ] | 7.8 | 0.7% | |
| CVE-2022-22675 Apple macOS Out-of-Bounds Write Vulnerability | [ HIGH ] | 7.8 | 12.5% | |
| CVE-2022-22674 Apple macOS Out-of-Bounds Read Vulnerability | [ MEDIUM ] | 5.5 | 1.1% | |
| CVE-2021-30713 Apple macOS Unspecified Vulnerability | [ HIGH ] | 7.8 | 7.0% | |
| CVE-2021-30657 Apple macOS Unspecified Vulnerability | [ MEDIUM ] | 5.5 | 68.5% |