MAL-2026-15605

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/m2fcsfyjkuxb/MAL-2026-15605.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-15605
Published
2026-08-26T14:55:09Z
Modified
2026-08-31T18:31:22.677765697Z
Summary
Malicious code in m2fcsfyjkuxb (npm)
Details

Published as part of a ClickFix-style fake-CAPTCHA phishing campaign documented by OX Security (see reference). The package's only file is index.html, declared as the npm "main" entry; package.json defines no preinstall/install/postinstall/prepare lifecycle script, so the payload does not execute at npm install time. index.html renders a fake Cloudflare Turnstile verification widget. An obfuscator.io-obfuscated inline script builds a hardcoded redirect URL to https://login.microsofte.live/ (a typosquat of a Microsoft sign-in domain), appends the visitor's original query-string parameters, and navigates the browser there via window.location.replace(). The package therefore does not attack the installing machine directly; it is used as a static file host on the npm CDN (e.g. unpkg/jsDelivr) so the index.html can be linked to and opened directly in a victim's browser as a phishing/ClickFix landing page. Published by npm user "johnvaldez9a" as part of a burst of near-identical single-purpose packages published between 2026-08-04 and 2026-08-24 that share this same fake-Turnstile-redirect page structure.

-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (25b5eb444b26c42c357352ff4bdc8f6e1020eefa1ae50ac18872aabb5a67b75e)

The package was found to contain malicious code or consuming dependency that contains malicious code

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-31T18:22:28.094283248Z",
            "id": "IN-MAL-2026-019279",
            "versions": [
                "1.0.0"
            ],
            "source": "amazon-inspector",
            "modified_time": "2026-08-31T17:58:39Z",
            "sha256": "25b5eb444b26c42c357352ff4bdc8f6e1020eefa1ae50ac18872aabb5a67b75e"
        }
    ]
}
References
Credits

Affected packages

npm / m2fcsfyjkuxb

Package

Name
m2fcsfyjkuxb
View open source insights on deps.dev
Purl
pkg:npm/m2fcsfyjkuxb

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.0

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/m2fcsfyjkuxb/MAL-2026-15605.json"
indicators 
{
    "evidence_files": [
        {
            "path": "index.html",
            "tlsh": "aed2b94233c138911107abb63b1bb3d5ea257c5fb6884c8bf64d7e44af96a04d6d0b34",
            "sha256": "4ecf6e0cf2de202dd42e09c1fb721bc9d732c47ef395335598ff90d774136a0a"
        }
    ],
    "package_integrity": [
        {
            "filename": "m2fcsfyjkuxb-1.0.0.tgz",
            "hashes": {
                "sha512_sri": "sha512-i+Jbiqv8QfNhZ+becqbr4342YAxJGgcCoR2LUVV6iEjviseQgKiVzLQB9mqj4JTXvBvCabngV1O2umSQz75gXQ==",
                "sha1": "efafbc4d1c7ae7050cc5a53e735f9a50f12304ab"
            }
        }
    ]
}
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]
iocs 
{
    "domains": [
        "login.microsofte.live"
    ],
    "files": [
        {
            "source": "PACKAGE_ARCHIVE",
            "paths": [
                "index.html"
            ],
            "note": "Fake Cloudflare Turnstile page bundled as the package's main entry (from v1.0.0, the latest published version)",
            "digests": {
                "sha256": "4ecf6e0cf2de202dd42e09c1fb721bc9d732c47ef395335598ff90d774136a0a"
            }
        }
    ]
}