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

CVE-2026-20643 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of iOS are affected by CVE-2026-20643?

Organizations using A cross-origin should be aware of moderate risk from CVE-2026-20643, a input validation vulnerability rated CVSS 5.4.. A patch is available.

iOS CVE-2026-20643

EUVD-2026-12663 MEDIUM

Improper Input Validation (CWE-20)

2026-03-17 apple

Authentication Bypass Apple iOS macOS Red Hat Suse

5.4

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Apr 09, 2026 - 14:30 nvd

Patch available

EUVD ID Assigned

Mar 17, 2026 - 22:54 euvd

EUVD-2026-12663

Analysis Generated

Mar 17, 2026 - 22:54 vuln.today

CVE Published

Mar 17, 2026 - 22:29 nvd

MEDIUM 5.4

DescriptionNVD

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.

AnalysisAI

A denial of service vulnerability in A cross-origin (CVSS 5.4). Remediation should follow standard vulnerability management procedures.

RemediationAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

Full analysis requires sign-in

Get intelligence summaries, risk assessment, exploit details, threat intel, and remediation guidance.

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Vendor StatusVendor

CVE-2026-20643 vulnerability details – vuln.today

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