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Apple iOS EUVDEUVD-2026-104707

| CVE-2026-84582 MEDIUM
Improper Access Control (CWE-284)
2026-10-20 apple GHSA-3934-4xv3-w89q
5.5
CVSS 3.1 · Vendor: apple
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Install malicious app on device
  2. Exploit
    Invoke under-restricted access path
  3. Impact
    Read sensitive user data

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Access control enforcement
MITRE ATT&CK

1 technique across 1 tactic: Defense Evasion

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires an attacker-controlled app already installed and executing locally on the affected Apple device (AV:L, PR:L, UI:N) - there is no remote or network vector and no user interaction beyond having run the malicious app. Apple describes only that the flaw was fixed with 'improved access restrictions,' so the specific feature, entitlement, or API that grants the improper access is not described in the available sources. Limiting factors: the attacker must first get code running on the device (e.g., a malicious app passing review or being sideloaded), impact is confined to reading data (no integrity/availability effect), and devices updated to the OS 27 releases are not affected.

Impact

This is a moderate-severity local information-disclosure flaw whose real-world priority is low-to-moderate despite the CRITICAL-sounding 'sensitive user data' phrasing. The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N, base 5.5) requires local access with low privileges - in practice a malicious or compromised app already running on the device - and yields only confidentiality impact with no integrity or availability effect. The exploitation signals are consistently low: EPSS is 0.16% (5th percentile), the vulnerability is NOT in CISA KEV, and no public exploit or PoC reference is present in the supplied data - only Apple advisory pages and the NVD mirror. The vuln.today decision label is 'this_month,' which aligns with the modest EPSS and absence of active exploitation: this warrants routine patching within a normal cycle rather than emergency action. No signals conflict here - CVSS, EPSS, and the (absent) KEV/PoC data all point the same direction. The main caveat is that Apple's description is deliberately sparse ('improved access restrictions'), so the exact trigger and the specific category of 'sensitive user data' are not described in the available sources.

Exploit ScenarioDerived

A user installs a seemingly benign third-party app from the App Store or a sideloaded source; once running locally with ordinary low privileges and no user interaction, the app leverages the improper access restriction to read sensitive user data it should not be permitted to see. No public exploit or PoC code is present in the supplied data, and the precise trigger is not described by Apple.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 30, 2026

Local information disclosure in Apple's OS 27 line (iOS/iPadOS, macOS Golden Gate, tvOS, visionOS, watchOS) allows an app already installed and running on the device to reach sensitive user data that should have been off-limits to it. Apple fixed the flaw with 'improved access restrictions' in the 27 releases, so any device still on an earlier build of these platforms remains exposed to an attacker who can first get code executing locally (AV:L, PR:L, UI:N); impact is confidentiality-only, with no integrity or availability effect. No public exploit has been identified at time of analysis, EPSS is low at 0.16% (5th percentile), and the flaw is not in CISA KEV, making this a this_month priority rather than an emergency.

RemediationAI

Vendor-released patch: update to iOS 27 and iPadOS 27, macOS Golden Gate 27, tvOS 27, visionOS 27, and watchOS 27 - the releases in which Apple states the issue is fixed; per-device advisories are at https://support.apple.com/en-us/149034, https://support.apple.com/en-us/149035, https://support.apple.com/en-us/149036, https://support.apple.com/en-us/149037, and https://support.apple.com/en-us/149038. Because exploitation requires an attacker-controlled app already running locally, reducing exposure before upgrading means limiting installation of untrusted or sideloaded applications and constraining which apps hold access to sensitive data; the available sources do not document a specific feature, entitlement, or setting to disable as a workaround, so updating to the OS 27 releases is the complete fix identified. Devices already on the 27 builds are not affected.

Affected VersionsENISA

macOS 0 <27
watchOS 0 <27
iOS and iPadOS 0 <27
visionOS 0 <27
tvOS 0 <27

Affected Packages

euvd ios_and_ipados fix: 27
euvd macos fix: 27
euvd tvos fix: 27
euvd visionos fix: 27
euvd watchos fix: 27

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 5 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The root cause is classed as CWE-284 (Improper Access Control): Apple's advisory states the privacy issue 'was addressed with improved access restrictions,' meaning the boundary that should have isolated sensitive user data from third-party app processes was insufficient. The assessed vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N confirms a purely local attack surface - the attacker needs an app already installed and executing on the target device, and no additional user interaction beyond having run that app - with high confidentiality impact and no scope change. Notably, the disclosed evidence does not describe which framework, entitlement, container, or API the improper access traversed; the trigger mechanism is not described in the available sources, and the fact that AC:L and UI:N are scored says nothing about timing, race conditions, or grooming behaviour. Affected platform families per the CPE data are Apple iOS and iPadOS, macOS, tvOS, visionOS, and watchOS, each in versions prior to the 27 release, consistent with a shared access-control component across Apple's operating systems.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (apple) PRIMARY 5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
vuln.today AI 5.5 MEDIUM

A locally-running low-privilege app triggers the flaw with no user interaction (AV:L/PR:L/UI:N); it only discloses sensitive data, so C:H with I:N/A:N.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (apple).

CVSS VectorVendor: apple

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

4
CVSS changed
Oct 30, 2026 - 20:23 NVD
5.5 (MEDIUM)
Patch available
Oct 20, 2026 - 02:01 EUVD
CVE Published
Oct 20, 2026 - 00:50 cve.org
MEDIUM 5.5
CVE Published
Oct 20, 2026 - 00:50 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

A privacy issue was addressed with improved access restrictions. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27, tvOS 27, visionOS 27, watchOS 27. An app may be able to access sensitive user data.

Threat Intelligence Overview

EPSS Score
0.2%
Top 95% exploitable
Prevalence
Ubiquitous
Apple iOS/iPadOS/macOS/tvOS/watchOS/visionOS span a huge share of consumer devices
Social Media
1
Sightings
Data Quality
4 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
High

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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