CVE-2026-65400 (GCVE-0-2026-65400)

Vulnerability from cvelistv5 – Published: 2026-08-06 18:17 – Updated: 2026-09-14 20:48
VLAI CISA Previdian
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 00:00 UTC
CWE
  • An attacker on the network may be able to authenticate to Screen Sharing without valid credentials
  • CWE-287 - Improper Authentication
Assigner
apple CNA under the mitre root
CNA scorecard E 37/100 over 619 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Apple macOS Affected: 0 , < 14.8.9 (custom)
Affected: 0 , < 15.7.9 (custom)
Affected: 0 , < 26.6.1 (custom)
Affected: 0 , < 26.7 (custom)
Affected: 0 , < 27 (custom)
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 9ee40067-b01d-4fde-93f7-5f384afb2252

Vulnerability ID: CVE-2026-65400

Status: Confirmed

Status Updated: 2026-08-18 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-18
Asserted: 2026-08-18
Scope
Notes: Apple macOS Improper Authentication Vulnerability | Affected: Apple / macOS | 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. | Due date: 2026-08-21 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-287
Feed CISA Known Exploited Vulnerabilities Catalog
Product macOS
Due Date 2026-08-21
Date Added 2026-08-18
Vendorproject Apple
Vulnerabilityname Apple macOS Improper Authentication Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-08-18 18:00 UTC | Updated: 2026-08-18 18:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 9560578e-f0f0-4ccb-8086-e52bc4e93614

Vulnerability ID: CVE-2026-65400

Status: Confirmed

Status Updated: 2026-08-15 07:24 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-15
Asserted: 2026-08-15
Scope
Notes: 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... | Affected: Apple / macOS | CVSS: 9.8 (CRITICAL) | EPSS: 0.09905 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title 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...
Vendor Apple
Product macOS
Added Date 2026-08-15T07:24:04.000Z
Cvss Score 9.8
Epss Score 0.09905
Cvss Severity CRITICAL
Epss Percentile 0.95285
Used In Malware unknown
Ahead Of Cisa Kev 
{
  "count": 3,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-09-10 07:10 UTC | Updated: 2026-09-10 07:10 UTC
Show details on NVD website
To clipboard 

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            "orgId": "286789f9-fbc2-4510-9f9a-43facdede74c",
            "shortName": "apple"
          },
          "references": [
            {
              "url": "https://support.apple.com/en-us/148170"
            },
            {
              "url": "https://support.apple.com/en-us/148171"
            },
            {
              "url": "https://support.apple.com/en-us/148172"
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "286789f9-fbc2-4510-9f9a-43facdede74c",
        "assignerShortName": "apple",
        "cveId": "CVE-2026-65400",
        "datePublished": "2026-08-06T18:17:18.263Z",
        "dateReserved": "2026-07-22T00:46:56.740Z",
        "dateUpdated": "2026-08-19T03:55:50.505Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.