CVE-2026-40416

Description

User interface (ui) misrepresentation of critical information in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Microsoft Edge (Chromium-based) < 2026-05-12 Security Update

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for UI Spoofing Concept
This script demonstrates how an attacker might overlay a fake UI element.
-->
<!DOCTYPE html>
<html>
<head>
<style>
  /* Overlay styling to mimic browser UI */
  .fake-dialog {
    position: fixed;
    top: 10px;
    right: 10px;
    background: #f1f1f1;
    border: 1px solid #ccc;
    padding: 10px;
    box-shadow: 2px 2px 5px rgba(0,0,0,0.2);
    z-index: 9999;
    font-family: sans-serif;
    width: 300px;
  }
  .fake-btn {
    background: #0078d4;
    color: white;
    border: none;
    padding: 5px 10px;
    margin-left: 10px;
    cursor: pointer;
  }
</style>
</head>
<body>

<div class="fake-dialog">
  <p>Security Alert: Please update your credentials.</p>
  <button class="fake-btn">Update</button>
  <button onclick="this.parentElement.style.display='none'">Ignore</button>
</div>

<p>Regular website content here to distract user...</p>

</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-40416
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-40416
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-40416/
[4] VulDB https://vuldb.com/cve/CVE-2026-40416
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40416

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-40416", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:17:19.687", "lastModified": "2026-05-13T15:34:52.573", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "User interface (ui) misrepresentation of critical information in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-451"}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40416", "source": "[email protected]"}]}}