Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-65400

macOS

Apple / macOS · affected before 14.8.9

Watch CVE-2026-65400 Browse KEV feed
Severity
CVSS 9.8 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
1.7%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-65400 is an unauthenticated vulnerability affecting Apple macOS. An authentication issue was addressed with improved state management. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.7.9, macOS...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

Apple / macOS affected before 14.8.9.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

An authentication issue was addressed with improved state management

An authentication issue was addressed with improved state management. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.7.9, macOS Sonoma 14.8.9, macOS Tahoe 26.6.1, macOS Tahoe 26.7.

An attacker on the network may be able to authenticate to Screen Sharing without valid credentials.

Apple Affected
macOS
Before 14.8.9 Before 15.7.9 Before 26.6.1 Before 26.7 Before 27
Published
06 Aug 2026
Exploitation Reported
15 Aug 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

macos cisa

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

The Hacker News

Recorded 15 Aug 2026

A trusted third party reported exploitation.

Proof of concept available

GitHub

Recorded 01 Aug 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
The Hacker News First 2026-08-15 07:24 UTC
CISA 2026-08-18 16:52 UTC
CVE 2026-08-18 17:51 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.8 Critical

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

1.7%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Authentication CWE-287

Recent mention · Full Disclosure Mailinglist

APPLE-SA-09-14-2026-4 macOS Tahoe 26.7

Posted by Apple Product Security via Fulldisclosure on Sep 22APPLE-SA-09-14-2026-4 macOS Tahoe 26.7 macOS Tahoe 26.7 addresses the following issues. Information about the security content is also available at https://support.apple.com/149042. Apple maintains a Security...

Read full advisory

All Mentions

Recent mention · Full Disclosure Mailinglist

APPLE-SA-09-14-2026-4 macOS Tahoe 26.7

Full Disclosure Mailinglist · 22 Sep 2026

Posted by Apple Product Security via Fulldisclosure on Sep 22APPLE-SA-09-14-2026-4 macOS Tahoe 26.7 macOS Tahoe 26.7 addresses the following issues. Information about the security content is also available at https://support.apple.com/149042. Apple maintains a Security Releases page at https://support.apple.com/100100 which lists recent software updates with security advisories. Accelerate Framework Available for: macOS Tahoe Impact: Processing a maliciously crafted image may lead to unexpected process...

Recent mention · Full Disclosure Mailinglist

APPLE-SA-09-14-2026-3 macOS Golden Gate 27

Full Disclosure Mailinglist · 22 Sep 2026

Posted by Apple Product Security via Fulldisclosure on Sep 22APPLE-SA-09-14-2026-3 macOS Golden Gate 27 macOS Golden Gate 27 addresses the following issues. Information about the security content is also available at https://support.apple.com/149035. Apple maintains a Security Releases page at https://support.apple.com/100100 which lists recent software updates with security advisories. Accelerate Framework Available for: MacBook Neo (2026), MacBook Air with Apple silicon (2020 and later), MacBook Pro...

Recent mention · RecordedFuture

August 2026 CVE Landscape

RecordedFuture · 08 Sep 2026

In August 2026, Insikt Group® identified 73 high-impact vulnerabilities that should be prioritized for remediation, 43 of which had a Very Critical Recorded Future Risk Score. This represents a 14% decrease from last month.

Recent mention · The Hacker News

Critical macOS, SharePoint, vCenter, and Microsoft IKE Flaws Under Active Exploitation

The Hacker News · 19 Aug 2026

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 in the wild. The shortcomings added to the KEV catalog are listed below - CVE-2026-65400 (CVSS score: 9.8) - An improper authentication vulnerability impacting Apple macOS that could allow an

Recent mention · The Hacker News

Apple macOS Screen Sharing Flaw Exploited on Internet-Exposed Macs to Install Monero Miner

The Hacker News · 15 Aug 2026

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 vulnerability in question is CVE-2026-65400 (CVSS score: 9.8), a critical authentication issue impacting the Screen Sharing component that could allow an attacker already on the network to

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

acheong08/CVE-2026-65400

github · Created 2026-08-22 08:54:26 UTC · 0 stars · AI assessment 90%

Apple MacOS Screen Sharing Arbitrary File read/write -> RCE

panchocosil/CVE-2026-65400-poc

github · Created 2026-08-21 18:22:37 UTC · 0 stars · AI assessment 90%

Read-only PoC for CVE-2026-65400 — macOS Screen Sharing (screensharingd) pre-auth SRP bypass giving root file read. Patched in macOS 26.6.1 / 15.7.9 / 14.8.9.

HORKimhab/CVE-2026-65400

github · Created 2026-08-18 01:45:39 UTC · 0 stars · AI assessment 90%

CVE-2026-65400 - Draft or TODO

Apple Screen Sharing Pre-Auth RCE

public · Created 2026-08-01 17:30:00 UTC

Timeline

From disclosure to observed exploitation

  1. 17:51 UTC

    KEV confirmed by CVE

    Exploitation attested by an external source

  2. 16:52 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  3. 07:24 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  4. 18:17 UTC

    CVE published

    Vulnerability disclosed publicly

  5. 17:30 UTC

    Public PoC available

    Public proof-of-concept code published

  6. 00:46 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
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GET /api/v2/pro/kevs/CVE-2026-65400

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-65400",
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": 0.01723,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}