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Known Exploited Vulnerability
9.8
CRITICAL CVSS 3.1
CVE-2026-65400
Apple macOS Improper Authentication Vulnerability - [Actively Exploited]
Overview
Description

An authentication issue was addressed with improved state management. This issue is fixed in macOS Sequoia 15.7.9, macOS Sonoma 14.8.9, macOS Tahoe 26.6.1. An attacker on the network may be able to authenticate to Screen Sharing without valid credentials.

Details
INFO

Published Date :

Aug. 6, 2026, 10:18 p.m.

Last Modified :

Aug. 19, 2026, 4:17 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

Apple macOS contains an improper authentication vulnerability that could allow an attacker on the network to authenticate to Screen Sharing without valid credentials.

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.

Known Ransomware Campaign Use:

Unknown

Notes :

https://support.apple.com/en-us/148170; https://support.apple.com/en-us/148171; https://support.apple.com/en-us/148172 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-65400

Impact
Affected Products

The following products are affected by CVE-2026-65400 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Apple macos
2 Apple macos
: Total Affected Vendor : 1 | Products : 2
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 HIGH 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 CRITICAL 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
Update affected systems to the latest versions to address authentication bypass.
  • Update macOS Sequoia to 15.7.9.
  • Update macOS Sonoma to 14.8.9.
  • Update macOS Tahoe to 26.6.1.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-65400.

URL Resource
https://support.apple.com/en-us/148170 Release Notes Vendor Advisory
https://support.apple.com/en-us/148171 Release Notes Vendor Advisory
https://support.apple.com/en-us/148172 Release Notes Vendor Advisory
http://seclists.org/fulldisclosure/2026/Aug/36 Mailing List
http://seclists.org/fulldisclosure/2026/Aug/37 Broken Link
https://advisories.ncsc.nl/2026/ncsc-2026-0280.html Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65400 US Government Resource
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-65400 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-65400 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-65400 vulnerability anywhere in the article.

  • TheCyberThrone
CISA Adds Five Actively Exploited Vulnerabilities to KEV in Just Two Days

A Five-Vulnerability Warning: From AI Infrastructure to Virtualization and Enterprise CollaborationThe U.S. Cybersecurity and Infrastructure  Security Agency (CISA) has added five vulnerabilities to i ... Read more

Published Date: Aug 20, 2026 (6 days, 20 hours ago)
  • The Hacker News
Critical macOS, SharePoint, vCenter, and Microsoft IKE Flaws Under Active Exploitation

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Tuesday added four critical vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, stating they are being exploited i ... Read more

Published Date: Aug 19, 2026 (1 week, 1 day ago)
  • The Hacker News
Apple macOS Screen Sharing Flaw Exploited on Internet-Exposed Macs to Install Monero Miner

A recently patched security flaw in Apple macOS has come under active exploitation in the wild to deploy a cryptocurrency miner, the Netherlands National Cyber Security Centre (NCSC) has warned. The v ... Read more

Published Date: Aug 15, 2026 (1 week, 5 days ago)
  • Ars Technica
Vulnerability giving attackers full control of Macs is under active exploitation

Dutch officials have warned that a high-severity macOS vulnerability that allows attackers to execute malicious code is under active exploitation. “The NCSC has received a notification indicating that ... Read more

Published Date: Aug 14, 2026 (1 week, 5 days ago)
  • security.nl
NCSC: Aanvallers installeren cryptominer via Screen Sharing-lek in macOS

Aanvallers maken actief misbruik van een beveiligingslek in macOS om systemen met cryptominers te infecteren. Dit soort malware gebruikte de rekenkracht van het systeem om cryptovaluta te minen, zo me ... Read more

Published Date: Aug 13, 2026 (2 weeks ago)
  • security.nl
NCSC meldt actief misbruik van Screen Sharing-lek in macOS

Het Nationaal Cyber Security Centrum (NCSC) meldt dat aanvallers actief misbruik maken van een kwetsbaarheid in de ScreenSharing-functie van macOS om zo toegang tot Macs te krijgen. Via Screen Sharing ... Read more

Published Date: Aug 12, 2026 (2 weeks, 1 day ago)
  • Huntress
From Screen Share to Root Access: Breaking Down CVE-2026-43760 and CVE-2026-65400 on macOS

Acknowledgments: Special thanks to Bryan Masters and Stuart Ashenbrenner for their contributions to this investigation and write-up. TL;DR:If you're running Screen Sharing on macOS and exposing it to ... Read more

Published Date: Aug 07, 2026 (2 weeks, 5 days ago)
  • security.nl
Apple dicht Screen Sharing-lek dat aanvaller toegang tot Macs kan geven

Apple heeft een beveiligingsupdate voor macOS uitgebracht die een kwetsbaarheid verhelpt waardoor ongeauthenticeerde aanvallers toegang tot Macs kunnen krijgen. Het beveiligingslek (CVE-2026-65400) is ... Read more

Published Date: Aug 07, 2026 (2 weeks, 6 days ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-65400 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 19, 2026

    Action Type Old Value New Value
    Changed SSVC {'id': 'CVE-2026-65400', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-18T17:44:20.737833Z'} {'id': 'CVE-2026-65400', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-14T00:00:00+00:00'}
  • Modified Analysis by [email protected]

    Aug. 18, 2026

    Action Type Old Value New Value
    Added Reference Type CISA-ADP: https://advisories.ncsc.nl/2026/ncsc-2026-0280.html Types: Third Party Advisory
    Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65400 Types: US Government Resource
    Added Reference Type CVE: http://seclists.org/fulldisclosure/2026/Aug/36 Types: Mailing List
    Added Reference Type CVE: http://seclists.org/fulldisclosure/2026/Aug/37 Types: Broken Link
  • CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725

    Aug. 18, 2026

    Action Type Old Value New Value
    Added Date Added 2026-08-18
    Added Due Date 2026-08-18
    Added Required Action 2026-08-18
    Added Vulnerability Name 2026-08-18
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 18, 2026

    Action Type Old Value New Value
    Added Reference https://advisories.ncsc.nl/2026/ncsc-2026-0280.html
    Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65400
    Changed SSVC {'id': 'CVE-2026-65400', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-15T03:55:51.774517Z'} {'id': 'CVE-2026-65400', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-18T17:44:20.737833Z'}
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 17, 2026

    Action Type Old Value New Value
    Changed SSVC {'id': 'CVE-2026-65400', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-14T00:00:00+00:00'} {'id': 'CVE-2026-65400', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-15T03:55:51.774517Z'}
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 15, 2026

    Action Type Old Value New Value
    Changed SSVC {'id': 'CVE-2026-65400', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-14T17:13:14.334858Z'} {'id': 'CVE-2026-65400', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-14T00:00:00+00:00'}
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 14, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Removed CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
    Changed SSVC {'id': 'CVE-2026-65400', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-07T00:16:06.397175Z'} {'id': 'CVE-2026-65400', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-14T17:13:14.334858Z'}
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Aug. 14, 2026

    Action Type Old Value New Value
    Added Reference http://seclists.org/fulldisclosure/2026/Aug/36
    Added Reference http://seclists.org/fulldisclosure/2026/Aug/37
  • Initial Analysis by [email protected]

    Aug. 07, 2026

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 14.0 up to (excluding) 14.8.9 *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 15.0 up to (excluding) 15.7.9 *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 26.0 up to (excluding) 26.6.1
    Added Reference Type Apple Inc.: https://support.apple.com/en-us/148170 Types: Release Notes, Vendor Advisory
    Added Reference Type Apple Inc.: https://support.apple.com/en-us/148171 Types: Release Notes, Vendor Advisory
    Added Reference Type Apple Inc.: https://support.apple.com/en-us/148172 Types: Release Notes, Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 07, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
    Added CWE CWE-287
    Added SSVC {'id': 'CVE-2026-65400', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-07T00:16:06.397175Z'}
  • New CVE Received by [email protected]

    Aug. 06, 2026

    Action Type Old Value New Value
    Added Affected [{'vendor': 'Apple', 'product': 'macOS', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '14.8.9', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '15.7.9', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '26.6.1', 'versionType': 'custom'}]}]
    Added Description An authentication issue was addressed with improved state management. This issue is fixed in macOS Sequoia 15.7.9, macOS Sonoma 14.8.9, macOS Tahoe 26.6.1. An attacker on the network may be able to authenticate to Screen Sharing without valid credentials.
    Added Reference https://support.apple.com/en-us/148170
    Added Reference https://support.apple.com/en-us/148171
    Added Reference https://support.apple.com/en-us/148172
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact