CVE-2026-8517

Description

Object lifecycle issue in WebShare in Google Chrome on Mac prior to 148.0.7778.168 allowed a remote attacker who convinced a user to engage in specific UI gestures to execute arbitrary code via a crafted HTML page. (Chromium security severity: Critical)

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

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

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-2026-8517 (Conceptual)
  This script attempts to trigger the object lifecycle issue in WebShare.
  It requires user interaction (UI:R) as per the vulnerability description.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8517 PoC</title>
</head>
<body>
    <h1>WebShare Object Lifecycle PoC</h1>
    <button id="triggerBtn">Click to Share (Trigger Exploit)</button>

    <script>
        document.getElementById('triggerBtn').addEventListener('click', async () => {
            console.log('Attempting to trigger WebShare vulnerability...');
            
            if (navigator.share) {
                try {
                    // Create a file to share, interacting with the WebShare API
                    const file = new Blob(['Exploit Data'], { type: 'text/plain' });
                    const shareData = {
                        title: 'CVE-2026-8517 Exploit',
                        text: 'Testing object lifecycle issue',
                        files: [file]
                    };

                    // The specific UI gesture triggers the object lifecycle bug
                    // In a real exploit, timing and heap grooming would happen here
                    await navigator.share(shareData);
                    
                } catch (error) {
                    console.error('Share failed or cancelled:', error);
                }
            } else {
                console.log('WebShare API is not supported in this browser.');
            }
        });
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8517
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8517
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8517/
[4] VulDB https://vuldb.com/cve/CVE-2026-8517
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/497531263

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8517", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:12.453", "lastModified": "2026-05-14T21:19:23.923", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Object lifecycle issue in WebShare in Google Chrome on Mac prior to 148.0.7778.168 allowed a remote attacker who convinced a user to engage in specific UI gestures to execute arbitrary code via a crafted HTML page. (Chromium security severity: Critical)"}], "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:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-664"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/497531263", "source": "[email protected]"}]}}