CVE-2026-65400

Summary

CVE	CVE-2026-65400
State	PUBLISHED
Assigner	apple
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-08-06 22:18:14 UTC
Updated	2026-08-19 04:17:34 UTC
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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.099050000 probability, percentile 0.952890000 (date 2026-09-10)

CISA KEV: Listed on 2026-08-18; due 2026-08-21; ransomware use Unknown

Problem Types: CWE-287 | An attacker on the network may be able to authenticate to Screen Sharing without valid credentials | CWE-287 CWE-287 Improper Authentication

Version	Source	Type	Score	Severity	Vector
3.1	ADP	DECLARED	9.8	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
3.1	134c704f-9b21-4f2e-91b3-4a467353bcc0	Secondary	9.8	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA Known Exploited Vulnerability

Vendor	Apple
Product	macOS
Name	Apple macOS Improper Authentication Vulnerability
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.
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

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Operating System	Apple	Macos	All	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Apple	MacOS	affected 14.8.9 custom	Not specified
CNA	Apple	MacOS	affected 15.7.9 custom	Not specified
CNA	Apple	MacOS	affected 26.6.1 custom	Not specified

References

Reference	Source	Link	Tags
support.apple.com/en-us/148171	[email protected]	support.apple.com	Release Notes, Vendor Advisory
seclists.org/fulldisclosure/2026/Aug/36	af854a3a-2127-422b-91ae-364da2661108	seclists.org	Mailing List
support.apple.com/en-us/148172	[email protected]	support.apple.com	Release Notes, Vendor Advisory
advisories.ncsc.nl/2026/ncsc-2026-0280.html	134c704f-9b21-4f2e-91b3-4a467353bcc0	advisories.ncsc.nl	Third Party Advisory
support.apple.com/en-us/148170	[email protected]	support.apple.com	Release Notes, Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog	134c704f-9b21-4f2e-91b3-4a467353bcc0	www.cisa.gov	US Government Resource
seclists.org/fulldisclosure/2026/Aug/37	af854a3a-2127-422b-91ae-364da2661108	seclists.org	Broken Link
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis
CISA Known Exploited Vulnerabilities catalog	CISA	www.cisa.gov	kev

No vendor comments have been submitted for this CVE.

Additional Advisory Data

Source	Time	Event
ADP	2026-08-18T00:00:00.000Z	CVE-2026-65400 added to CISA KEV

There are currently no legacy QID mappings associated with this CVE.