Cyber Resilience

CVE-2026-28837

High

Published: 25 March 2026

Published
25 March 2026
Modified
25 March 2026
KEV Added
—
Patch
—
CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS Score 0.0005 15.9th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-28837 is a high-severity Improper Access Control (CWE-284) vulnerability in Apple Macos. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Data from Local System (T1005); ranked at the 15.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-28837 is a logic issue addressed through improved checks, affecting macOS versions prior to Tahoe 26.4. The vulnerability, classified under CWE-284 (Improper Access Control), enables an app to access sensitive user data. It carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N), highlighting its potential for high-impact confidentiality breaches.

Attackers can exploit this vulnerability remotely over the network with low complexity, requiring no privileges, authentication, or user interaction. Exploitation allows unauthorized access to sensitive user data, compromising confidentiality without impacting integrity or availability.

Apple's advisory confirms the issue is fixed in macOS Tahoe 26.4. Additional details are available at https://support.apple.com/en-us/126794.

EU & UK References

Vulnerability details

A logic issue was addressed with improved checks. This issue is fixed in macOS Tahoe 26.4. An app may be able to access sensitive user data.

CWE(s)
CWE-284

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1005 Data from Local System Collection
Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.
attack.mitre.org →
Why these techniques?

Improper access control (CWE-284) directly enables unauthorized reading of sensitive user data from the local macOS system, mapping to T1005 Data from Local System. Remote attack vector and lack of privileges/UI requirements support local data collection post-exploitation, but generic description limits precision.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1

CVEs Like This One

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CVE-2025-43198Same product: Apple Macos
CVE-2025-30460Same product: Apple Macos
CVE-2025-24241Same product: Apple Macos
CVE-2025-30424Same product: Apple Macos
CVE-2025-24204Same product: Apple Macos
CVE-2024-44303Same product: Apple Macos
CVE-2025-24263Same product: Apple Macos

Affected Assets

apple
macos
26.0 — 26.4

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

AC-3 Access Enforcement good match
prevent

Directly enforces approved authorizations and checks to prevent apps from accessing sensitive user data, addressing the core logic issue in access control.

SI-2 Flaw Remediation good match
prevent

Remediates the specific logic flaw by identifying, reporting, and applying the macOS Tahoe 26.4 patch with improved checks.

AC-6 Least Privilege partial match
prevent

Limits app access to only necessary sensitive user data via least privilege, reducing the impact of improper access control bypasses.

References