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Visionos EUVDEUVD-2026-15135

| CVE-2026-28861 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-03-25 apple
XSS Apple Visionos Ios And Ipados
4.3
CVSS 3.1 · Vendor: apple
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Vulnerability Assessment

Weakness
CWE
CWE-79
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

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

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Impact

This vulnerability carries moderate to high real-world risk despite the absence of a CVSS score in the available data. The attack vector is network-based (user visits a malicious website), the attack complexity is low (exploit requires only HTML/JavaScript), and no authentication is required. The information disclosure impact is classified as significant since script message handlers often carry sensitive data including session tokens and user identifiers. The lack of a public CVSS score and EPSS rating suggests either pre-disclosure coordination or rapid patching, which limits available exploitation data. However, the fact that Apple issued patches across five distinct advisory pages (126792, 126793, 126794, 126799, 126800) and coordinated fixes across Safari, iOS, iPadOS, macOS, and visionOS indicates Apple's assessment that this represents a critical cross-platform risk. The logic-based nature of the vulnerability (rather than memory corruption) means it is likely reliably exploitable without significant complexity. Given that script messaging is a core iOS/macOS security boundary mechanism, this vulnerability should be treated as a high-priority patch despite the absence of formal CVSS metrics.
Exploit ScenarioDerived

An attacker creates a malicious website and tricks a user into visiting it via social engineering or malicious advertisement. Once the page loads, the attacker's JavaScript exploits the state management flaw in Safari's script message handler routing to intercept WKScriptMessageHandler calls that were intended for a legitimate banking or authentication website. The attacker receives sensitive data such as OAuth tokens, CSRF parameters, or user session identifiers that would normally only be visible to the legitimate origin. With this information, the attacker can then conduct account takeover, session hijacking, or direct fraud. Because the exploit requires only a malicious website and standard browser navigation (no user interaction beyond clicking a link), the practical risk is amplified in scenarios where users visit untrusted sites or click phishing links.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 25, 2026

A logic error in Apple's script message handler implementation allows malicious websites to access script message handlers intended for other origins, resulting in unauthorized cross-origin information disclosure. This vulnerability affects Safari 26.4 and earlier, iOS/iPadOS 18.7.7 and earlier, macOS Tahoe 26.4 and earlier, and visionOS 26.4 and earlier. An attacker can craft a malicious website that exploits improper state management in the message handler routing mechanism to intercept sensitive data intended for legitimate web applications, potentially exposing authentication tokens, user data, or other confidential information passed through script messaging interfaces.

RemediationAI

Immediately upgrade to Safari 26.4 or later, iOS/iPadOS 18.7.7 or later (or iOS/iPadOS 26.4 or later on supported devices), macOS Tahoe 26.4 or later, or visionOS 26.4 or later. These patches address the logic flaw in script message handler state management by improving validation of origin context before routing messages. Users should enable automatic updates in Settings > General > Software Update (iOS/iPadOS) or System Settings > General > Software Update (macOS) to ensure timely patching. Until patches can be applied, restrict web browsing to trusted websites only and disable JavaScript where feasible for non-essential browsing. Organizations managing Safari deployments should use Mobile Device Management (MDM) or enterprise deployment tools to enforce immediate patching across all endpoints. Refer to Apple's official security advisories at https://support.apple.com/en-us/126792 (Safari), https://support.apple.com/en-us/126793 (iOS), https://support.apple.com/en-us/126794 (iPadOS), https://support.apple.com/en-us/126799 (macOS), and https://support.apple.com/en-us/126800 (visionOS) for version-specific guidance.

Affected VersionsENISA

visionOS 0 <26.4
iOS and iPadOS 0 <18.7.7
macOS 0 <26.4
iOS and iPadOS 0 <26.4
Safari 0 <26.4

Affected Packages

euvd ios_and_ipados fix: 18.7.7, 26.4
euvd macos fix: 26.4
euvd safari fix: 26.4
euvd visionos fix: 26.4

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 4 packages in euvd

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Technical ContextAI · show details

The vulnerability resides in Apple's WebKit engine, specifically in the script message handler subsystem that facilitates communication between web content and native application code. Script message handlers (WKScriptMessageHandler) are a documented API for bridging JavaScript in web pages with native Swift or Objective-C code. The root cause is classified as a logic error in state management—meaning the handler routing mechanism fails to properly maintain or validate the origin context when routing incoming messages. Rather than a traditional memory safety issue, this is a design flaw where the handler state does not correctly enforce same-origin policy constraints, allowing a malicious origin to read messages destined for a different origin. The affected CPE strings (cpe:2.3:a:apple:safari, cpe:2.3:a:apple:ios_and_ipados, cpe:2.3:a:apple:macos, cpe:2.3:a:apple:visionos) indicate the vulnerability spans Safari browser and all iOS, iPadOS, macOS, and visionOS platforms that share the common WebKit rendering engine.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (apple) PRIMARY 4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
SUSE MEDIUM
Red Hat 4.3 HIGH

Primary rating from Vendor (apple).

CVSS VectorVendor: apple

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

Lifecycle Timeline

2
Patch available
Apr 16, 2026 - 05:29 EUVD
26.4,18.7.7
CVE Published
Mar 25, 2026 - 00:32 nvd
MEDIUM 4.3

DescriptionCVE.org

A logic issue was addressed with improved state management. This issue is fixed in 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. A malicious website may be able to access script message handlers intended for other origins.

Executive ViewAI

Why It Matters

Organizations using A logic should be aware of moderate risk from CVE-2026-28861 rated CVSS 4.3. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low
Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score
0.0%
Top 95% exploitable
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment Vendor VulDB

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 0.0%
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
Defer
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact
Low
Technical Impact
Partial

Priority Score

22
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +22
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting MEDIUM

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Development Tools 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP6-LTSS Fixed

References

Advisories & patches
ADVISORY https://vuldb.com/vuln/352958 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1364/ REF https://access.redhat.com/security/cve/CVE-2026-28861 REF https://bugzilla.redhat.com/show_bug.cgi?id=2453007 REF https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28861.json REF https://support.apple.com/en-us/126792 REF https://support.apple.com/en-us/126793 REF https://support.apple.com/en-us/126794 REF https://support.apple.com/en-us/126799 REF https://support.apple.com/en-us/126800

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