GHSA-8PFG-3P4C-36VM
Vulnerability from github – Published: 2026-09-04 15:36 – Updated: 2026-09-04 15:36sift (sift.js) 17.1.3 enumerates query keys with for...in, which walks the object prototype chain, and dispatches any matched operator key including $where. The $where operation compiles a string value into a function using new Function unless CSP_ENABLED is set (not set by default). As a result, if a prototype-pollution primitive elsewhere in the process sets Object.prototype.$where to a malicious string, even benign filter calls such as sift({}) execute arbitrary JavaScript. Additionally, passing an untrusted query object containing a string $where directly to sift results in code execution under the default configuration.
{
"affected": [],
"aliases": [
"CVE-2026-85625"
],
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-04T15:17:42Z",
"severity": "CRITICAL"
},
"details": "sift (sift.js) 17.1.3 enumerates query keys with for...in, which walks the object prototype chain, and dispatches any matched operator key including $where. The $where operation compiles a string value into a function using new Function unless CSP_ENABLED is set (not set by default). As a result, if a prototype-pollution primitive elsewhere in the process sets Object.prototype.$where to a malicious string, even benign filter calls such as sift({}) execute arbitrary JavaScript. Additionally, passing an untrusted query object containing a string $where directly to sift results in code execution under the default configuration.",
"id": "GHSA-8pfg-3p4c-36vm",
"modified": "2026-09-04T15:36:14Z",
"published": "2026-09-04T15:36:14Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85625"
},
{
"type": "WEB",
"url": "https://github.com/crcn/sift.js/issues/276"
},
{
"type": "WEB",
"url": "https://github.com/crcn/sift.js"
},
{
"type": "WEB",
"url": "https://github.com/crcn/sift.js/blob/v17.1.3/src/core.ts"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/sift-17.1.3-prototype-pollution-remote-code-execution-via-where"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
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