CVE-2026-42891

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

6.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:android:*:* - VULNERABLE

Microsoft Edge (Chromium-based)

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- PoC for UI Misrepresentation / Spoofing -->
<!-- This PoC demonstrates how a malicious page might mimic browser UI elements -->
<!DOCTYPE html>
<html>
<head>
    <title>Microsoft Edge Spoofing PoC</title>
    <style>
        /* CSS to mimic browser address bar or dialogs */
        .fake-ui {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: #f1f1f1;
            padding: 8px;
            font-family: sans-serif;
            border-bottom: 1px solid #ccc;
            z-index: 9999;
        }
    </style>
</head>
<body>
    <div class="fake-ui">https://www trusted-site.com/login</div>
    <div style="margin-top: 50px;">
        <h2>请登录您的账户</h2>
        <!-- Malicious form mimicking a trusted site -->
    </div>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-42891
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-42891
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-42891/
[4] VulDB https://vuldb.com/cve/CVE-2026-42891
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42891

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-42891", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:17:26.207", "lastModified": "2026-05-14T14:26:49.890", "vulnStatus": "Analyzed", "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:H/PR:N/UI:N/S:U/C:H/I:L/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-451"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:android:*:*", "versionEndExcluding": "148.0.3967.55", "matchCriteriaId": "8EABB908-A752-4662-AF28-6A89F60EBBF8"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42891", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}