Threat Intelligence Report: CVE-2026-65369

Executive Summary

CVE-2026-65369 is a logic vulnerability in Apple's macOS operating system that allows a malicious application to bypass Gatekeeper checks. Gatekeeper is macOS's core security control that verifies code signing and notarization before permitting application execution, serving as the first line of defense against untrusted binaries. The flaw is addressed through improved state management and affects macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7 prior to their respective patched builds. With a CVSS score of 5.5 and integrity-only impact, the vulnerability requires local access and user interaction, but successful exploitation undermines the trust model that enterprises rely upon to prevent execution of unauthorized or malicious software.

Technical Analysis

CVE-2026-65369 is classified under CWE-693 (Protection Mechanism Failure), a category describing weaknesses where a security control intended to prevent a given class of attack does not function as designed. The NVD description explicitly states that "a logic issue was addressed with improved state management," which identifies the root cause as a flaw in the internal state-tracking logic of the affected component rather than a memory-safety defect such as a buffer overflow or use-after-free.

The affected protection mechanism is Gatekeeper — the macOS subsystem that evaluates whether an application should be allowed to execute based on code signature validity, notarization status, and quarantine attributes. Because the issue is described as a "logic issue," the vulnerability is expected to manifest as an inconsistency in the sequence or state transitions that Gatekeeper relies upon to reach an allow/deny decision. A logic flaw of this nature typically arises when a component makes a security decision without correctly re-evaluating state after a change, or when cached state is trusted beyond its validity window.

The CVSS vector provides meaningful constraints on the attack surface. The AV:L (Attack Vector: Local) metric confirms the attacker cannot exploit this remotely over a network — they must already have a foothold or be able to place a file on the target system. The UI:R (User Interaction: Required) metric indicates that the victim must take some action, consistent with a scenario in which a user attempts to launch an application that Gatekeeper should block. The PR:N (Privileges Required: None) metric is significant: the attacker does not need elevated privileges to trigger the bypass. The impact metrics C:N/I:H/A:N (Confidentiality: None, Integrity: High, Availability: None) reflect that the core harm is integrity — the ability to execute code that the platform's trust model would otherwise reject — without direct confidentiality or availability consequences at the point of exploitation.

The exact internal component, function, or API involved is not disclosed in the available data. Analysis of the specific malformed state transition exploited is not possible without the vendor's full advisory or a published patch diff. What can be stated definitively is the vulnerability class (protection mechanism failure in Gatekeeper), the trigger requirement (local execution context with user interaction), and the security outcome (Gatekeeper checks bypassed). Any description of specific internal mechanisms beyond this would be speculative.

Exploitation Scenarios

No public proof-of-concept, exploit code, or Nuclei template is available for CVE-2026-65369. The attack chain below is inferred from the vulnerability class (CWE-693, Gatekeeper bypass) and the CVSS vector, and describes the attack at the vulnerability-class level. No specific function names, file paths, or API endpoints are asserted because none are present in the source data.

1. Reconnaissance and target identification. An attacker identifies a macOS endpoint running a vulnerable build (Golden Gate 27, Sequoia 15.8, or Tahoe 26.7 prior to patch). Because exploitation is local and requires user interaction, the attacker must first establish a presence on the host or deliver a file to the host through another vector — for example, a phishing email with a malicious application bundle, a downloaded disk image, or a compromised update channel. Note that a network-facing initial access position is not required by this CVE itself, but is a prerequisite in practice for delivering the malicious application.

2. Triggering the logic flaw. The attacker crafts an application bundle designed to induce the inconsistent state that the Gatekeeper logic mishandles. When the victim launches this application, Gatekeeper's evaluation of the bundle encounters the flawed state-management condition, and the expected block does not occur. The precise state transition abused is not publicly documented; the vulnerability class indicates the protection evaluates incorrectly — for example, allowing execution despite a signature, notarization, or quarantine state that should have caused a denial.

3. Execution. With the Gatekeeper check bypassed, the malicious application executes on the host. The CVSS UI:R metric indicates that the victim's launch action is the trigger — there is no reported self-executing or remote-trigger path.

4. Post-exploitation impact. The immediate effect is code execution in the user's context, unconstrained by the trust controls that Gatekeeper enforces. Per the I:H integrity metric, the primary consequence is that untrusted code achieves execution and can alter the system's security state — for example, modifying the on-disk artifacts or configuration that subsequent security decisions depend upon. The attacker's subsequent objectives (persistence, lateral movement, exfiltration) depend entirely on the payload embedded in the application and are not specified by this CVE.

Because no exploit code is public and EPSS is 0.00178 (7.6th percentile), the demonstrated likelihood of near-term weaponization is low. However, the Apple CVE list is a target for advanced persistent threat groups and malware operators seeking to evade macOS's built-in protections, and this class of vulnerability is generally under-exploited in the wild rather than being technically unexploitable.

Impact Assessment

The business impact of CVE-2026-65369 centers on the erosion of a foundational endpoint trust control. Gatekeeper is a default-enabled, widely relied-upon defense for preventing execution of unsigned, unnotarized, or quarantined applications on macOS. A bypass weakens the primary technical control that enterprises depend upon to enforce the "only approved software runs" policy across their Mac fleets.

• Confidentiality (C:N): The CVSS vector assigns no direct confidentiality impact.
• Integrity (I:H): High integrity impact — the attacker achieves execution of code the platform intended to block, and can thereby modify application and system state subject to the executing user's permissions.
• Availability (A:N): No availability impact is indicated.
• Attack Vector (L) / Complexity (L) / Privileges (N) / User Interaction (R): The attack surface is local and low-complexity; no privileges are required. The one friction point is user interaction, which in practice means the victim must open or launch the malicious application.

Blast radius. Any unpatched Mac running the affected OS versions is in scope. Organizations with large macOS fleets — creative, engineering, and executive user bases are common Mac-heavy populations — face the broadest exposure. The blast radius is bounded by the requirement for local delivery and user interaction, which limits mass-exploitation scenarios relative to a remote, unauthenticated flaw. A user is generally affected only if they personally trigger the malicious application; there is no indicated automatic propagation path.

Operational risk rating. Likely Medium for most enterprises: the bypass requires local delivery and user action, no public exploit exists, and EPSS is low — but the direct consequence is defeat of a critical endpoint trust control, and the exploit chain is straightforward once a malicious bundle reaches a victim.

Detection Guidance

Detection for this vulnerability class is challenging because the exploitation outcome appears benign — an application simply runs. Defenders should focus on anomalous application launches, Gatekeeper/quarantine state inconsistencies, and process-execution telemetry correlated to user-interactive download sources (mail, browsers, removable media). The rules below are behavioral and class-based; no published IoCs exist for this CVE.

Sigma Rule

title: Possible Gatekeeper Bypass via Anomalous Unsigned Application Launch (CVE-2026-65369)
id: 8f3c1e2a-5b7d-4c9e-a1f6-2d6e8b0c4a11
status: experimental
description: Detects execution of applications from staging directories with no valid signature context, indicative of attempted Gatekeeper trust-control bypass.
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-65369
author: ValtersIT Threat Intelligence
date: 2026-07-01
logsource:
  product: macos
  category: process_creation
  service: endpointsecurity
detection:
  selection_paths:
    - Image|startswith: '/private/var/folders/'
    - Image|startswith: '/tmp/'
    - Image|startswith: '/Users/Shared/'
  selection_bundle:
    Image|endswith: '.app/Contents/MacOS/'
  filter_known:
    Image|contains: '/Applications/'
  filter_signed:
    SigningStatus: 'valid'
  condition: (selection_paths or selection_bundle) and not filter_known and not filter_signed
fields:
  - Image
  - ParentImage
  - User
  - SigningStatus
falsepositives:
  - Development builds and ad-hoc signed tools during software engineering
  - User-compiled applications in build directories
level: medium
tags:
  - attack.defense_evasion
  - attack.t1553.001

YARA Rule

rule macOS_CVE_2026_65369_Unsigned_Bundle_Staging
{
    meta:
        author = "ValtersIT Threat Intelligence"
        description = "Hunts for unsigned application bundles staged outside /Applications, consistent with Gatekeeper bypass delivery for CVE-2026-65369"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-65369"
        date = "2026-07-01"
        severity = "medium"

    strings:
        $info = "CFBundleExecutable" ascii
        $ident = "CFBundleIdentifier" ascii
        $exec = "Mach-O" ascii
        $quarantine = "com.apple.quarantine" ascii

    condition:
        (uint32be(0) == 0xCAFEBABE or uint32be(0) == 0xFEEDFACF) and
        ($info and $ident) and
        not $quarantine
}

Note: this YARA rule is intentionally conservative and targets the on-disk characteristics of an application bundle (Mach-O magic and Info.plist keys) rather than claiming a unique byte signature, since no sample bytes are available for this CVE.

Suricata IDS Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"VALTERSIT Possible macOS App Download Preceding CVE-2026-65369 Gatekeeper Bypass"; flow:established,to_server; content:"GET"; http_method; content:".dmg"; http_uri; nocase; threshold: type both, track by_src, count 5, seconds 300; classtype:misc-activity; sid:202665369; rev:1; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-65369; metadata:created_at 2026_07_01;)

Note: CVE-2026-65369 has no network exploitation surface. This Suricata rule provides indirect coverage only, flagging repeated macOS disk-image downloads that may represent the delivery stage of a malicious application bundle.

Elastic Detection

process where host.os.type == "macos" and
  event.category == "process" and event.type == "start" and
  process.executable : ("/private/var/folders/*", "/tmp/*", "/Users/Shared/*") and
  process.executable : "*.app/Contents/MacOS/*" and
  not process.code_signature.trusted == true

Splunk SPL Query

index=macos_edr event.category=process action=start
| where match(process_path, "\.app/Contents/MacOS/")
| where NOT match(process_path, "^/Applications/") AND NOT match(process_path, "^/System/")
| eval signing_ok=if(signing_status=="valid", 1, 0)
| where signing_ok=0
| stats count values(process_path) as launched_binaries values(parent_process) as parents by host, user
| where count > 0
| sort - count

Wazuh OSSEC Rule

<group name="macos,gatekeeper,cve-2026-65369,">
  <rule id="202653691" level="10">
    <decoded_as>json</decoded_as>
    <field name="event.category">process</field>
    <field name="host.os.type">macos</field>
    <field name="process.executable" type="pcre2">^\/(private\/var\/folders|tmp|Users\/Shared)\/.*\.app\/Contents\/MacOS\/</field>
    <description>CVE-2026-65369: Possible Gatekeeper bypass - unsigned app launched from staging path</description>
    <mitre>
      <id>T1553.001</id>
    </mitre>
    <group>defense_evasion,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 2/4 (CLAIMED — single source claims patch; not independently confirmed). The only patch information available originates from the NVD record, which states the issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. There is no independently confirmed vendor advisory or KB reference in the supplied data; treat the patch status as provisional and verify against Apple's official security releases before relying upon it.

1. Immediate mitigations (before or where patching is not yet possible):

   • Enforce application control on macOS endpoints (allowlisting) so that only signed, notarized, and approved applications may run regardless of Gatekeeper state. This provides defense-in-depth if Gatekeeper logic is bypassed.
   • Restrict execution from world-writable and user-staging locations such as /tmp, /Users/Shared, and /private/var/folders, which are common delivery paths for malicious bundles.
   • Reduce the user-interaction attack surface: block or heavily filter application bundles (.app, .dmg, .pkg) from email attachments and untrusted download sources via mail gateway and web proxy policy.
   • Ensure Endpoint Detection and Response (EDR) coverage is healthy across Mac fleets, with process-execution and code-signature telemetry collected.

2. Patch / upgrade steps:

   • Verify the current macOS build against Apple's official security advisory for the fixed versions (Golden Gate 27, Sequoia 15.8, Tahoe 26.7). Do not treat the CNA of this report as confirmation.
   • Upgrade affected hosts through the standard macOS software update mechanism or an MDM-managed update policy.
   • Prioritize patching for macOS-heavy user populations and users with access to sensitive data or administrative tooling.
   • Confirm the new build after updating and track fleet compliance to the patched versions.

3. Long-term hardening:

   • Maintain centralized, MDM-enforced application control and code-signing policy so security does not depend on a single OS control.
   • Monitor Apple security releases continuously for this and related Gatekeeper vulnerabilities and shorten the patch latency window for endpoints.
   • Correlate endpoint process telemetry with download and email telemetry to detect delivery-stage activity even when the bypass itself is silent.

References

1. NVD — CVE-2026-65369: https://nvd.nist.gov/vuln/detail/CVE-2026-65369
2. MITRE ATT&CK — T1553.001, Subvert Trust Controls: Gatekeeper Bypass: https://attack.mitre.org/techniques/T1553/001/
3. CWE-693 — Protection Mechanism Failure: https://cwe.mitre.org/data/definitions/693.html
4. Apple Product Security Releases (verify fixed builds for macOS Golden Gate 27, Sequoia 15.8, Tahoe 26.7): https://support.apple.com/en-us/100100
5. FIRST EPSS (CVE-2026-65369): https://api.first.org/data/v1/epss?cve=CVE-2026-65369

Exploit-in-the-wild / threat actor status: No evidence of exploitation in the wild. CISA KEV: NO. EPSS: 0.00178 (7.6th percentile). No public PoC, exploit code, or Nuclei template is available. No known threat actor campaigns are associated with this CVE as of the date of this report.