CVE-2026-8528

Description

Insufficient validation of untrusted input in SiteIsolation in Google Chrome prior to 148.0.7778.168 allowed a remote attacker who had compromised the renderer process to bypass Site Isolation via a crafted HTML page. (Chromium security severity: High)

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 < 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-2026-8528: Site Isolation Bypass
Description: Conceptual HTML page demonstrating the trigger mechanism.
Note: Actual exploitation requires a prior renderer process compromise.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8528 PoC</title>
</head>
<body>
    <h1>Site Isolation Bypass Test</h1>
    <script>
        // Simulate the crafted input that bypasses validation
        // This payload targets the insufficient validation in SiteIsolation
        var maliciousPayload = {
            target: "cross-origin-process",
            bypass_trigger: true
        };

        // Attempt to trigger the vulnerability
        try {
            // In a real scenario, this would involve specific APIs or DOM manipulations
            // that confuse the SiteIsolation logic regarding process ownership.
            console.log("Sending crafted payload to bypass SiteIsolation...");
            window.postMessage(maliciousPayload, "*");
        } catch (e) {
            console.log("Exploit failed: " + e.message);
        }
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8528
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8528
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8528/
[4] VulDB https://vuldb.com/cve/CVE-2026-8528
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/487795397

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8528", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:13.613", "lastModified": "2026-05-15T16:16:15.697", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient validation of untrusted input in SiteIsolation in Google Chrome prior to 148.0.7778.168 allowed a remote attacker who had compromised the renderer process to bypass Site Isolation via a crafted HTML page. (Chromium security severity: High)"}], "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": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-20"}]}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-20"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/487795397", "source": "[email protected]"}]}}