CVE-2026-8536

Description

Insufficient validation of untrusted input in ReadingMode in Google Chrome on Mac 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

3.1

Severity

LOW

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Google Chrome (Mac) < 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-2026-8536
Concept: Crafted HTML to trigger ReadingMode bypass
Note: Actual exploitation requires a renderer RCE chain first.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8536 PoC</title>
</head>
<body>
    <!-- Malicious payload targeting ReadingMode validation -->
    <div id="target">
        <!-- Specific structure to bypass site isolation checks -->
        <script>
            // Attempt to access cross-origin data via the vulnerability
            console.log("Attempting to trigger Site Isolation bypass...");
            // hypothetical exploit logic
        </script>
    </div>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8536
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8536
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8536/
[4] VulDB https://vuldb.com/cve/CVE-2026-8536
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/495857582

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8536", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:14.457", "lastModified": "2026-05-15T15:16:54.667", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient validation of untrusted input in ReadingMode in Google Chrome on Mac 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:H/PR:N/UI:R/S:U/C:L/I:N/A:N", "baseScore": 3.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "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/495857582", "source": "[email protected]"}]}}