Is CVE-2026-20643 actively exploited?

No active exploitation of CVE-2026-20643 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-20643 be exploited remotely?

Yes. CVE-2026-20643 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-20643?

CVE-2026-20643 has a CVSS score of 5.4 (MEDIUM).

HOME VULNERABILITIESCVE-2026-20643

MEDIUM

CVE-2026-20643

Published: March 17, 2026· Updated: Mar 19, 2026

5.4

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-20643 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Affected Vendors & Products

Apple3 products

ipadosiphone osmacos

Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Exploit-DB

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

PacketStorm

Security advisories & exploits

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://support.apple.com/en-us/126604

News & Research Mentioning CVE-2026-20643

Apple patches WebKit bug that could let sites access your data

Malwarebytes Labs· Mar 18, 2026

Apple has released a Background Security Improvement that silently fixes a WebKit vulnerability (CVE-2026-20643). [xlite_meta score:52 src:Malwarebytes Labs xlite_fp:d447cb3352f5f40426b4b2285f3691eb3931f11c39fa6316db66046c8fb06804]

Apple Fixes WebKit Vulnerability Enabling Same-Origin Policy Bypass on iOS and macOS

The Hacker News· Mar 18, 2026

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 (CVSS score: N/A), has been described as a cross-origin issue in WebKit's Navigation API that could be exploited to bypass the same-origin policy when processing maliciously crafted web content. The [xlite_meta score:50 src:The Hacker News xlite_fp:46cadbaa882f8730d23c054f933f5931ca4d2f600d6f9e3e7702d2dfd71b7c61]

Apple pushes first Background Security Improvements update to fix WebKit flaw

BleepingComputer· Mar 17, 2026

Apple has released its first Background Security Improvements update to fix a WebKit flaw tracked as CVE-2026-20643 on iPhones, iPads, and Macs without requiring a full operating system upgrade. [...] [xlite_meta score:58 src:BleepingComputer xlite_fp:e785ea9771550ca014b69f96fadae964e08700bec508cffa9c1417788271d258]