MAL-2026-15607

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/mbxcnsuwgs1/MAL-2026-15607.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-15607
Published
2026-08-26T14:55:09Z
Modified
2026-08-31T18:31:23.939618548Z
Summary
Malicious code in mbxcnsuwgs1 (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 POSTs a hardcoded per-package "hostKey" to https://api.keyval.org/get, receives a base64-encoded IV:ciphertext pair, decrypts it client-side via the Web Crypto API (AES-CTR) using an embedded key to obtain a redirect URL, appends the visitor's original query-string parameters, and navigates the browser there via window.location.replace(). This "dead drop" design lets the operator change the phishing destination for every package sharing a hostKey without republishing to npm; OX Security observed keyval.org-served destinations including a typosquatted Microsoft login page and, at time of writing, a ChatGPT redirect. 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 (1dcbd9c1d41f7cb0f208e9d3a855f7b72b87b24e05fb0831554b57d5bfbe7a07)

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

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-31T18:22:28.029524439Z",
            "source": "amazon-inspector",
            "versions": [
                "1.0.0"
            ],
            "id": "IN-MAL-2026-019278",
            "modified_time": "2026-08-31T17:58:32Z",
            "sha256": "1dcbd9c1d41f7cb0f208e9d3a855f7b72b87b24e05fb0831554b57d5bfbe7a07"
        }
    ]
}
References
Credits

Affected packages

npm / mbxcnsuwgs1

Package

Name
mbxcnsuwgs1
View open source insights on deps.dev
Purl
pkg:npm/mbxcnsuwgs1

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/mbxcnsuwgs1/MAL-2026-15607.json"
indicators 
{
    "package_integrity": [
        {
            "filename": "mbxcnsuwgs1-1.0.0.tgz",
            "hashes": {
                "sha512_sri": "sha512-3YeWigI6sKU663mmAV6db/Z4DxQ8rELYLedp4iIUszAEUaWAbCIO868pQacLYct6Yq7/3zndf8zhll9GH739Wg==",
                "sha1": "55e36225512a655f8279dc1134937cb0cbc36661"
            }
        }
    ]
}
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]
iocs 
{
    "domains": [
        "api.keyval.org"
    ],
    "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": "b2434adc2b108f96922d167f47141cf12acba1ceff7ef2dea74916bb5488d907"
            }
        }
    ]
}