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CVE-2026-65400

CRITICAL 9.8 KNOWN EXPLOITED PoC CATALOGUED ALL-YEARS

Published 2026-08-06 · Last modified 2026-09-14 · apple · NVD: Analyzed

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.

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2026-08-18. Patch or mitigate now.

Exploitation likelihood

1.7%chance of exploitation in 30 days · 77th percentile

● In CISA KEV (2026-08-18)● Catalogued PoC◆ SSVC: exploitation active, automatable yes

Impact if exploited

9.8CVSS 3.1 · CRITICAL · ADP

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

Public PoC or exploit resources are catalogued below.

Listed by the named source; Vulnpedia has not tested these resources.

PoC data: JSON

Resource commands

curl -s https://vulnpedia.com/cve/CVE-2026-65400/poc.jsonMachine-readable PoC index for this CVE (for automation).

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Apple

Products Macos

Weakness (CWE)

  • CWE-287: Improper Authentication

CVSS vector

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

References and research data (JSON)

Unverified PoC candidates

Catalogue matches for further research. These repositories have not been validated as working exploits.

3 candidates

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

  • VulnCheck KEV · 2026-08-07T00:00:00Z

    Source guidance: 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.

    Source ransomware assessment: Unknown

    VulnCheck KEV · CVE-2026-65400 · Updated 2026-08-07T00:00:00Z
  • VulnCheck KEV · 2026-08-07T00:00:00ZVulnCheck KEV · CVE-2026-65400
  • VulnCheck KEV · 2026-08-12T00:00:00ZVulnCheck KEV · CVE-2026-65400
  • VulnCheck KEV · 2026-08-15T00:00:00ZVulnCheck KEV · CVE-2026-65400
  • VulnCheck KEV · 2026-08-17T00:00:00ZVulnCheck KEV · CVE-2026-65400
  • VulnCheck KEV · 2026-08-18T00:00:00ZVulnCheck KEV · CVE-2026-65400
  • VulnCheck KEV · 2026-09-01T00:00:00ZVulnCheck KEV · CVE-2026-65400
  • VulnCheck KEV · 2026-09-03T00:00:00ZVulnCheck KEV · CVE-2026-65400
  • VulnCheck KEV · 2026-09-08T00:00:00ZVulnCheck KEV · CVE-2026-65400

Known Affected Software Configurations

VendorProductVersion range
AppleMacos≥ 14.0 and < 14.8.9
AppleMacos≥ 15.0 and < 15.7.9
AppleMacos≥ 26.0 and < 26.6.1

All CVSS metrics

  • CRITICAL 9.8 v3.1 · ADP Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CRITICAL 9.8 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS