MAL-2026-4737
Vulnerability from ossf_malicious_packages
-= Per source details. Do not edit below this line.=-
Source: amazon-inspector (8a82d9cce1cd5cae0e9bae039dc08eccc18ec4494b182d11ab35c25ac4496d34)
On import in a browser context, index.js creates a hidden iframe pointing at https://www.pendo.io/?builder.frameEditing=true and postMessages a 'builder.patchUpdates' payload to 20 hardcoded builder- resources, replacing their '/bindings/show' binding with an injected script. The injected script calls fetch('https://novus-api.pendo.io/pendo/app', {credentials:'include'}), base64-encodes the authenticated response, and beacons it in 2000-byte chunks to https://webhook.site/ea1a1f2d-46e2-463a-a1c1-48c53846dff4 via new Image().src. Any application that bundles this package will silently exfiltrate its end users' authenticated Pendo session data to an anonymous attacker-controlled webhook. The package self-describes as 'Security research PoC' but the destination is not a researcher-owned domain and the targeting (hardcoded victim UUIDs, credentials-included fetch) is consistent with a live attack rather than a contained PoC.
- CWE-506 - The product contains code that appears to be malicious in nature.
{
"affected": [
{
"database_specific": {
"cwes": [
{
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature.",
"name": "Embedded Malicious Code"
}
],
"indicators": {
"evidence_files": [
{
"path": "index.js",
"sha256": "5c332aea70085f86d39ea772daacebddd49e4cafd182b3713582ddc0d361198d",
"tlsh": "dc411fbb2330049416b3616669379f1bf4b32b3b94e18992f8bacb64d5a3a801471b4d"
}
],
"package_integrity": [
{
"filename": "your-unique-package-name1-1.0.0.tgz",
"hashes": {
"sha1": "bcc7580ab94e7570290df4e578614426b6ccbaa1",
"sha512_sri": "sha512-HUHnRypedL351NSuz0qg6hvWwtjdWV7wgwpXP23/Wgef2MkZt2FoRw5v/xlSMIDkfiG70Y0a7rjMyCopZKZNrA=="
}
}
]
}
},
"package": {
"ecosystem": "npm",
"name": "your-unique-package-name1"
},
"versions": [
"1.0.0"
]
}
],
"credits": [
{
"contact": [
"actran@amazon.com"
],
"name": "Amazon Inspector",
"type": "FINDER"
}
],
"database_specific": {
"malicious-packages-origins": [
{
"id": "IN-MAL-2026-004569",
"import_time": "2026-05-26T05:52:51.563611848Z",
"modified_time": "2026-05-25T02:44:28Z",
"sha256": "8a82d9cce1cd5cae0e9bae039dc08eccc18ec4494b182d11ab35c25ac4496d34",
"source": "amazon-inspector",
"versions": [
"1.0.0"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (8a82d9cce1cd5cae0e9bae039dc08eccc18ec4494b182d11ab35c25ac4496d34)\nOn import in a browser context, index.js creates a hidden iframe pointing at https://www.pendo.io/?builder.frameEditing=true and postMessages a \u0027builder.patchUpdates\u0027 payload to 20 hardcoded builder-\u003cuuid\u003e resources, replacing their \u0027/bindings/show\u0027 binding with an injected script. The injected script calls fetch(\u0027https://novus-api.pendo.io/pendo/app\u0027, {credentials:\u0027include\u0027}), base64-encodes the authenticated response, and beacons it in 2000-byte chunks to https://webhook.site/ea1a1f2d-46e2-463a-a1c1-48c53846dff4 via new Image().src. Any application that bundles this package will silently exfiltrate its end users\u0027 authenticated Pendo session data to an anonymous attacker-controlled webhook. The package self-describes as \u0027Security research PoC\u0027 but the destination is not a researcher-owned domain and the targeting (hardcoded victim UUIDs, credentials-included fetch) is consistent with a live attack rather than a contained PoC.\n",
"id": "MAL-2026-4737",
"modified": "2026-05-25T02:44:28Z",
"published": "2026-05-25T02:44:28Z",
"references": [
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/your-unique-package-name1/v/1.0.0"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in your-unique-package-name1 (npm)"
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.