CVE-2026-20678 – This CVE describes an authorization vulnerabili... (How to Fix)

Q: What is the severity of CVE-2026-20678?

CVE-2026-20678 has a CVSS score of 5.5 (MEDIUM). This CVE describes an authorization vulnerability in iOS and iPadOS that allows malicious apps to bypass access controls and read sensitive user data. The vulnerability affects iOS/iPadOS versions before the patched releases. Users who haven't updated their devices are at risk of data exposure.

📋 TL;DR

This CVE describes an authorization vulnerability in iOS and iPadOS that allows malicious apps to bypass access controls and read sensitive user data. The vulnerability affects iOS/iPadOS versions before the patched releases. Users who haven't updated their devices are at risk of data exposure.

💻 Affected Systems

Products:

iOS
iPadOS

Versions: Versions before iOS 26.3, iPadOS 26.3, iOS 18.7.5, and iPadOS 18.7.5

Operating Systems: iOS, iPadOS

Default Config Vulnerable: ⚠️ Yes

Notes: All devices running affected iOS/iPadOS versions are vulnerable by default.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Malicious app could access sensitive user data including personal information, authentication tokens, or private files without user consent.

🟠

Likely Case

Malicious app in the App Store could exploit this to harvest user data for advertising or profiling purposes.

🟢

If Mitigated

With proper app review processes and user permission controls, impact is limited to apps that users intentionally install.

🌐 Internet-Facing: LOW - This requires local app execution, not direct internet exposure.

🏢 Internal Only: MEDIUM - Risk exists if users install untrusted apps on corporate devices.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Requires malicious app installation and execution on target device.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: iOS 26.3, iPadOS 26.3, iOS 18.7.5, iPadOS 18.7.5

Vendor Advisory: https://support.apple.com/en-us/126346

Restart Required: Yes

Instructions:

1. Open Settings app. 2. Tap General. 3. Tap Software Update. 4. Download and install the available update. 5. Restart device when prompted.

🔧 Temporary Workarounds

Restrict App Installation

all

Only allow installation of apps from trusted sources like the App Store

Review App Permissions

all

Regularly review and restrict app permissions in Settings

🧯 If You Can't Patch

Implement mobile device management (MDM) to control app installation
Use app whitelisting to only allow approved applications

🔍 How to Verify

Check if Vulnerable:

Check iOS/iPadOS version in Settings > General > About > Version

Check Version:

Settings > General > About > Version

Verify Fix Applied:

Verify version is iOS 26.3+, iPadOS 26.3+, iOS 18.7.5+, or iPadOS 18.7.5+

📡 Detection & Monitoring

Log Indicators:

Unusual app data access patterns in device logs
Apps requesting permissions they shouldn't need

Network Indicators:

Suspicious data exfiltration from mobile devices

SIEM Query:

Search for app permission escalation events or unusual data access patterns

📊 Metadata

CVE ID: CVE-2026-20678

CVSS v3 Score: 5.5 (MEDIUM)

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

CWE: CWE-200

EPSS Score: 0.01% exploit probability (0.9th percentile)

Published: February 11, 2026

Last Updated: February 13, 2026

🔗 References

https://support.apple.com/en-us/126346 Release Notes,Vendor Advisory
https://support.apple.com/en-us/126347 Release Notes,Vendor Advisory

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