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5.4
MEDIUM CVSS 3.1
CVE-2026-20643
Apple Navigation API Cross-Origin Policy Bypass
Overview
Description

A cross-origin issue in the Navigation API was addressed with improved input validation. This issue is fixed in Background Security Improvements for iOS, iPadOS, and macOS, Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, visionOS 26.4. Processing maliciously crafted web content may bypass Same Origin Policy.

Details
INFO

Published Date :

March 17, 2026, 11:16 p.m.

Last Modified :

March 25, 2026, 1:17 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-20643 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Apple macos
2 Apple iphone_os
3 Apple safari
4 Apple ipados
5 Apple visionos
: Total Affected Vendor : 1 | Products : 5
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
Update affected systems to the latest security patch to prevent Same Origin Policy bypass.
  • Update iOS to version 26.3.1 or later.
  • Update iPadOS to version 26.3.1 or later.
  • Update macOS to version 26.3.1 or 26.3.2 or later.
Public PoC/Exploit Available at Github

CVE-2026-20643 has a 4 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-20643.

URL Resource
https://support.apple.com/en-us/126604 Release Notes Vendor Advisory
https://support.apple.com/en-us/126792
https://support.apple.com/en-us/126793
https://support.apple.com/en-us/126794
https://support.apple.com/en-us/126799
https://support.apple.com/en-us/126800
http://seclists.org/fulldisclosure/2026/Mar/10
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20643 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-20643 weaknesses.

CAPEC-3: Using Leading 'Ghost' Character Sequences to Bypass Input Filters Using Leading 'Ghost' Character Sequences to Bypass Input Filters CAPEC-7: Blind SQL Injection Blind SQL Injection CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client CAPEC-23: File Content Injection File Content Injection CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-28: Fuzzing Fuzzing CAPEC-31: Accessing/Intercepting/Modifying HTTP Cookies Accessing/Intercepting/Modifying HTTP Cookies CAPEC-42: MIME Conversion MIME Conversion CAPEC-43: Exploiting Multiple Input Interpretation Layers Exploiting Multiple Input Interpretation Layers CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-52: Embedding NULL Bytes Embedding NULL Bytes CAPEC-53: Postfix, Null Terminate, and Backslash Postfix, Null Terminate, and Backslash CAPEC-63: Cross-Site Scripting (XSS) Cross-Site Scripting (XSS) CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic Using Slashes and URL Encoding Combined to Bypass Validation Logic CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog() CAPEC-71: Using Unicode Encoding to Bypass Validation Logic Using Unicode Encoding to Bypass Validation Logic CAPEC-72: URL Encoding URL Encoding CAPEC-73: User-Controlled Filename User-Controlled Filename CAPEC-78: Using Escaped Slashes in Alternate Encoding Using Escaped Slashes in Alternate Encoding CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic Using UTF-8 Encoding to Bypass Validation Logic CAPEC-81: Web Server Logs Tampering Web Server Logs Tampering CAPEC-83: XPath Injection XPath Injection CAPEC-85: AJAX Footprinting AJAX Footprinting CAPEC-88: OS Command Injection OS Command Injection CAPEC-101: Server Side Include (SSI) Injection Server Side Include (SSI) Injection CAPEC-104: Cross Zone Scripting Cross Zone Scripting CAPEC-108: Command Line Execution through SQL Injection Command Line Execution through SQL Injection CAPEC-109: Object Relational Mapping Injection Object Relational Mapping Injection CAPEC-110: SQL Injection through SOAP Parameter Tampering SQL Injection through SOAP Parameter Tampering CAPEC-120: Double Encoding Double Encoding CAPEC-135: Format String Injection Format String Injection CAPEC-136: LDAP Injection LDAP Injection CAPEC-153: Input Data Manipulation Input Data Manipulation CAPEC-182: Flash Injection Flash Injection CAPEC-209: XSS Using MIME Type Mismatch XSS Using MIME Type Mismatch CAPEC-230: Serialized Data with Nested Payloads Serialized Data with Nested Payloads CAPEC-231: Oversized Serialized Data Payloads Oversized Serialized Data Payloads CAPEC-250: XML Injection XML Injection CAPEC-261: Fuzzing for garnering other adjacent user/sensitive data Fuzzing for garnering other adjacent user/sensitive data CAPEC-267: Leverage Alternate Encoding Leverage Alternate Encoding CAPEC-473: Signature Spoof Signature Spoof CAPEC-588: DOM-Based XSS DOM-Based XSS CAPEC-664: Server Side Request Forgery Server Side Request Forgery CAPEC-21: Exploitation of Trusted Identifiers Exploitation of Trusted Identifiers CAPEC-59: Session Credential Falsification through Prediction Session Credential Falsification through Prediction CAPEC-60: Reusing Session IDs (aka Session Replay) Reusing Session IDs (aka Session Replay) CAPEC-75: Manipulating Writeable Configuration Files Manipulating Writeable Configuration Files CAPEC-76: Manipulating Web Input to File System Calls Manipulating Web Input to File System Calls CAPEC-89: Pharming Pharming CAPEC-111: JSON Hijacking (aka JavaScript Hijacking) JSON Hijacking (aka JavaScript Hijacking) CAPEC-141: Cache Poisoning Cache Poisoning CAPEC-142: DNS Cache Poisoning DNS Cache Poisoning CAPEC-160: Exploit Script-Based APIs Exploit Script-Based APIs CAPEC-384: Application API Message Manipulation via Man-in-the-Middle Application API Message Manipulation via Man-in-the-Middle CAPEC-385: Transaction or Event Tampering via Application API Manipulation Transaction or Event Tampering via Application API Manipulation CAPEC-386: Application API Navigation Remapping Application API Navigation Remapping CAPEC-387: Navigation Remapping To Propagate Malicious Content Navigation Remapping To Propagate Malicious Content CAPEC-388: Application API Button Hijacking Application API Button Hijacking CAPEC-510: SaaS User Request Forgery SaaS User Request Forgery

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
Fliv/CVE-2026-20643

CVE-2026-20643 test page

HTML JavaScript

Updated: 2 weeks ago
1 stars 1 fork 1 watcher
Born at : March 20, 2026, 6:29 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
nukash/webkit-navigation-key-bug

None

HTML

Updated: 2 weeks, 6 days ago
0 stars 0 fork 0 watcher
Born at : March 20, 2026, 12:20 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
zeroxjf/WebKit-NavigationAPI-SOP-Bypass

WebKit NavigateEvent.canIntercept SOP bypass via cross-port interception — iOS 26.3.1 BSI (CVE-2026-20643)

HTML

Updated: 2 weeks, 4 days ago
5 stars 1 fork 1 watcher
Born at : March 17, 2026, 8:32 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
nomi-sec/PoC-in-GitHub

📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.

security cve exploit poc vulnerability

Updated: 3 days, 21 hours ago
7620 stars 1243 fork 1243 watcher
Born at : Dec. 8, 2019, 1:03 p.m. This repo has been linked 766 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-20643 vulnerability anywhere in the article.

  • CybersecurityNews
Apple Expands iOS 18.7.7 Update to More Devices to Shield Users from DarkSword Exploit

Apple has taken the rare step of expanding the availability of iOS 18.7.7 and iPadOS 18.7.7 to a broader set of devices on April 1, 2026, pushing critical backported security patches to millions of us ... Read more

Published Date: Apr 02, 2026 (1 week ago)
  • The Hacker News
⚡ Weekly Recap: CI/CD Backdoor, FBI Buys Location Data, WhatsApp Ditches Numbers & More

Another week, another reminder that the internet is still a mess. Systems people thought were secure are being broken in simple ways, showing many still ignore basic advisories. This edition covers a ... Read more

Published Date: Mar 23, 2026 (2 weeks, 2 days ago)
  • Daily CyberSecurity
Unmasking DarkSword: GTIG Exposes Full-Chain iOS Exploit Used by Global Spies

Timeline of DarkSword observations and vulnerability patches | Image: GTIG In a comprehensive technical disclosure, the Google Threat Intelligence Group (GTIG) has revealed the existence of a highly s ... Read more

Published Date: Mar 22, 2026 (2 weeks, 3 days ago)
  • Daily CyberSecurity
PoC Exploit Publicly Disclosed: Apple Deploys First-Ever Background Security Patch for Cross-Origin Flaw

Apple has broken new ground in its defensive strategy, utilizing a “Background Security Improvements” feature to deliver an out-of-band fix for a significant cross-origin vulnerability. The flaw, trac ... Read more

Published Date: Mar 21, 2026 (2 weeks, 5 days ago)
  • The Cyber Express
Android Malware Campaign Targets Indian Users via Fake eChallan Alerts

A new Android malware campaign targeting Indian users has been reported by the Indian Computer Emergency Response Team, CERT-In. According to the agency, multiple reports indicate a coordinated effort ... Read more

Published Date: Mar 20, 2026 (2 weeks, 6 days ago)
  • The Cyber Express
Pixel Watch Users Report Inflated Steps, Missing SpO2 Data

A recent Pixel firmware update released in March 2026 has sparked concern among Pixel Watch users, as reports of inaccurate Fitbit tracking, missing SpO2 readings, and inflated activity data continue ... Read more

Published Date: Mar 20, 2026 (2 weeks, 6 days ago)
  • The Cyber Express
Interlock Ransomware Leveraged Cisco FMC Zero-Day 36 Days Before Patch

Amazon’s threat intelligence teams have uncovered a new cyber campaign linked to the Interlock ransomware group. The campaign centers around a flaw affecting Cisco Secure Firewall Management Center (F ... Read more

Published Date: Mar 19, 2026 (3 weeks ago)
  • The Cyber Express
Apple Patches WebKit Vulnerability CVE-2026-20643 Across iOS, macOS

Apple has released a new security update to address a critical WebKit vulnerability tracked as CVE-2026-20643. The vulnerability was identified as a cross-origin issue within the Navigation API of Web ... Read more

Published Date: Mar 19, 2026 (3 weeks ago)
  • CybersecurityNews
Apple WebKit Vulnerability Enables Malicious Web Content Bypass on iOS and macOS

Apple WebKit Vulnerability Enables Malicious Web Content Bypass on iOS and macOS Apple has released critical security patches to address a high-severity WebKit vulnerability that allows maliciously cr ... Read more

Published Date: Mar 18, 2026 (3 weeks ago)
  • Help Net Security
Apple starts issuing lightweight security updates between software releases

Apple is delivering small security updates, called Background Security Improvements, starting with iOS 26.1, iPadOS 26.1, and macOS 26.1. Apple describes Background Security Improvements as lightweigh ... Read more

Published Date: Mar 18, 2026 (3 weeks, 1 day ago)
  • security.nl
Apple rolt eerste 'background security improvement' uit wegens WebKit-lek

Apple heeft wegens een WebKit-lek voor het eerst een 'background security improvement' uitgerold voor iOS, iPadOS en macOS. Background security improvements worden uitgebracht tussen de normale softwa ... Read more

Published Date: Mar 18, 2026 (3 weeks, 1 day ago)
  • The Hacker News
Apple Fixes WebKit Vulnerability Enabling Same-Origin Policy Bypass on iOS and macOS

Apple on Tuesday released its first round of Background Security Improvements to address a security flaw in WebKit that affects iOS, iPadOS, and macOS. The vulnerability, tracked as CVE-2026-20643 (CV ... Read more

Published Date: Mar 18, 2026 (3 weeks, 1 day ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-20643 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    Mar. 25, 2026

    Action Type Old Value New Value
    Changed Description A cross-origin issue in the Navigation API was addressed with improved input validation. This issue is fixed in Background Security Improvements for iOS 26.3.1, iPadOS 26.3.1, macOS 26.3.1, and macOS 26.3.2. Processing maliciously crafted web content may bypass Same Origin Policy. A cross-origin issue in the Navigation API was addressed with improved input validation. This issue is fixed in Background Security Improvements for iOS, iPadOS, and macOS, Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, visionOS 26.4. Processing maliciously crafted web content may bypass Same Origin Policy.
    Added Reference https://support.apple.com/en-us/126792
    Added Reference https://support.apple.com/en-us/126793
    Added Reference https://support.apple.com/en-us/126794
    Added Reference https://support.apple.com/en-us/126799
    Added Reference https://support.apple.com/en-us/126800
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Mar. 19, 2026

    Action Type Old Value New Value
    Added Reference http://seclists.org/fulldisclosure/2026/Mar/10
  • Initial Analysis by [email protected]

    Mar. 18, 2026

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* versions up to (excluding) 26.3.1 *cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* versions up to (excluding) 26.3.1 *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions up to (excluding) 26.3.1
    Added Reference Type Apple Inc.: https://support.apple.com/en-us/126604 Types: Release Notes, Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Mar. 18, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
    Added CWE CWE-20
    Added CWE CWE-346
  • New CVE Received by [email protected]

    Mar. 17, 2026

    Action Type Old Value New Value
    Added Description A cross-origin issue in the Navigation API was addressed with improved input validation. This issue is fixed in Background Security Improvements for iOS 26.3.1, iPadOS 26.3.1, macOS 26.3.1, and macOS 26.3.2. Processing maliciously crafted web content may bypass Same Origin Policy.
    Added Reference https://support.apple.com/en-us/126604
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 5.4
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact